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mathematics
statistics

Questions and Answers of Statistics

1. What is the observed minimum and maximum score for how many number of glasses drank per week? How is this different from the possible minimum and maximum scores?2. What is the range?3. What is the
1. Consider the data for glasses of water drank per day and answer the questions that follow.a. Graph a histogram and frequency polygram of these data. Remember to label your axes and title the
What is the z score and percentile for a person who rated importance of having the newest cell phone model as a 4?
Go back to Application 6.1 earlier in this chapter and review the study by Ziefle and Bay (2005).1. State null and alternative hypotheses for the impact of phone complexity on the time it takes to
1. Are the following alternative hypotheses directional or non directional? One- or two tailed?a. Ha: Students with low verbal ability are more likely to plagiarize than those with high verbal
Can you enter information from the Ziefle and Bay (2005) study from Application 6.2 in the different boxes of the flow chart below?
1. Which of the following results would be considered statistically significant at the p (a) p = .05 (b) p = .005 (c) p = .10 (d) p = .001 (e) p = .02 (f) p = .0092. A researcher sets the criterion
Suppose you believe that students from your campus text more than most students. You collect data from 15 students about the number of texts they sent in the last hour and compare it to a national
Suppose you see an advertisement for a new version of the iPhone that claims that it is less complex than older versions and allows you to complete tasks more quickly than the older versions. The ad
1. Give examples of the following kinds of relationships. Do not use examples already provided in the text or by your professor.€¢ Positive relationship€¢ Negative relationship€¢ Two
A researcher is interested in the relationship between the time (measured in minutes) spent exercising per week and scores on a life satisfaction scale that ranges from 10 to 70, with higher scores
Continuing with the example from Practice 7.2, suppose you find the regression equation for predicting life satisfaction from time spent exercising the study is Y ′ = .059X + 34.5.• Using this
USA Today article reported that the United States saw a slight increase in pedestrian fatalities in 2010. One reason cited for this increase was the increased use of cell phones and mobile music
Suppose a researcher wants to determine if talking on the phone causes more pedestrian accidents than listening to music. The researcher recruits a group of university students and first has them
Design an experiment to test if using a mobile device while walking can cause accidents. Be sure that your study controls for threats to internal validity and is ethical.
Identify which of these variables can and cannot be independent variables in an experiment. Explain your rationale for how you categorized each one.• The weather• Room color• Participant
Does the use of cell phones while driving increase aggression by other drivers?1. Identify the IV in this study.2. How could you manipulate your IV for a simple experiment?3. What is the DV, and how
1. Given the results in the cell phone study discussed in the previous section, what is the probability of making a Type I error? A Type II error? How do you know?2. What are the implications of
Suppose we have conducted a study that examines the impact of auditory distraction on test performance.The test contains 50 items, each of which counts as 2 points. Students complete the testin a
Complete the following summary table.Hint: Remember the relationship between the different types of sums of squares and degrees of freedom (SStot = SSB + SSw and dftot = dfB + dfw).a) How many
A researcher conducted a study to determine if level of self-disclosure affects the trustworthiness of an individual. Participants were randomly assigned to engage in a 5-minute conversation with a
In a series of studies, Strayer et al. (2003) examined the distraction of drivers in a driving simulation because of cell phone conversations. They hypothesized that driving errors would be made
A researcher examines the impact of service learning on critical-thinking skills. The researcher uses a sample of college students enrolled in a developmental psychology course. The researcher
Researchers have found that college student pedestrians are prone to accidents when using their phones in various ways while crossing the street (Byington & Schwebel, 2013; Schwebel et al., 2012;
a. Complete the summary table above. (Hint: Refer to the description of the summary table for information about what sources add up to the total sums of squares and the total degrees of freedom.)b.
You want to know whether information in a syllabus truly affects whether students are likely to take a class. You prepare three syllabi for a Developmental Psychology class, which vary only in the
1. A study examining how gender and political affiliation impact environmental attitudes is a(n) correlational, quasi-experimental, experimental, or hybrid factorial design?2. A researcher randomly
Cadinu et al. (2006) found support for the theory of stereotype threat that members of a group may underperform when they are told that a test assesses a skill their group is stereotypically poor at.
A researcher hypothesizes that ADHD symptoms will exacerbate the distracting impact of a cell phone ringing during a lecture. She conducts a 2 (ring vs. no ring) Ã— 2 (low ADHD symptoms
In Practice 11.4, we asked you to complete an ANOVA summary table for a study in which a researcher hypothesized that ADHD symptoms will exacerbate the distracting impact of a cell phone ringing
Name the type of contingency table (2 × 2, 4 × 6, etc.), the minimum sample size required, the chisquare statistic, and effect size statistic (if the chi-square is significant) that are most
Identify the most appropriate statistic to analyze each of the following studies and explain why you should use the statistical test you have named.1. Is there a favorite snack among elementary
Identify the most appropriate statistic to analyze each of the following studies and explain why you should use the statistical test you have named. 1. An instructor is interested in developing
A student wonders if the Research Methods class he took actually improved his ability to cite and paraphrase sources. He had all of his writing assignments from the semester prior to taking research
1. Our Topic:After reading and discussing past research about academic honesty and the use of technology throughout this textbook, we realize that these topics do not need to be mutually exclusive.
1. Our Topic:a. We want to examine the relationship between professors' personality and the frequency in which they use social media sites.Recall from Practice 14.1 that because personality is a
Based on the information provided, identify the appropriate statistical analysis for each situation. When appropriate, identify the effect size you should calculate and any post hoc tests you might
Solve the following equations applying the rules of order of operations: a. 4√52 (3*2) = ____________ b. (4)(5 + 3*2) = ____________ c. 4\√5 + (3*2) = ____________ d. 42(5 + 3*2) =
Solve the following equations applying the rules of order of operations: a. √5 * 6 + 6 - 32 - 2 = b. (4 + 72 - 17)/6 = c. 6 - 2 * 2 + 9/3 = d. 100 - 10 * 5 - 5 = e. √(12 - 8) * 16 - 2 =
Reexpress the following equations, substituting reciprocals for division. Then, solve in decimal form.
Reexpress the following equations, substituting reciprocals for division. Then, solve in decimal form.
Rearrange the equation to solve for the indicated unknown.
Complete the following chart:
Rearrange the equation to solve for the indicated unknown.
Expand the following expressions, using the rules for summation within parentheses and for binomial expansion (Numerals are always constants; thus, N is always a constant): a. ∑(1 + N)
Complete the following chart:
Round the following numbers to two decimal places: a. 77.935 __________ b. 1086.267 __________ c. 39.633 __________
Round the following numbers to two decimal places: a. 110.001 _________ b. 12.635 _________ c. 276.772 _________
Are the following variables discrete or continuous? Mark "D" or "C" to indicate your
What are the real limits of the following scores?
What are the real limits of the following scores?
Indicate the first letter (N, 0, I, R) of the highest possible scale for each of the following measures, where N is lowest and R is highest:
Indicate the first letter (N, 0, I, R) of the highest possible scale for each of the following measures, where N is lowest and R is highest: Measure Highest Scale a. Favorite radio
Indicate the first letter (N, 0, I, R) of the highest possible scale for each of the following measures, where N is lowest and R is highest:
Are the following variables discrete or continuous? Mark "D" or "C" to indicate your answer:
Students in an experimental psychology lab time how long it takes rats to run a maze. Ten students run the same 20 rats. Here is the average running time (to the nearest second) for each rat:a.
Thirty computer users were asked to record the number of spam e-mails they received in the past week. After a week, they reported the following data:24, 3, 18, 27, 13, 5, 2, 10, 7, 21, 5, 3, 1, 0,
In Table 3.6, what exact score falls at the 75th percentile rank? Use the appropriate formula.
A college instructor logs attendance throughout the semester for a class of 32 students that meets on M-W-F. Here is the number of classes each student missed during the semester. Create a table, in
Twenty-five families were asked how many TV sets they currently have in their home. Here are the data. Create a table, in descending score order, showing frequency and cumulative frequency.2, 3, 1,
Return to Exercise 2 from earlier in this module. Add columns for relative frequency (percentage) and cumulative relative frequency (cumulative percentage).
Return to Exercise 4 earlier in this module. Add columns for relative frequency (percentage) and cumulative relative frequency (cumulative percentage).2, 3, 1, 2, 3, 0, 2, 4, 1, 2, 4, 3, 2, 1, 1, 3,
For the following color preferences of third-grade children at an elementary school,Red = 18,Orange - 4,Yellow = 3,Green = 15,Blue = 26,Purple = 12, andPink = 7,a. Construct a bar diagram, andb.
For the following declared concentrations of 100 college students, Social sciences = 32 Business = 16 Humanities = 28 Science = 10 Allied health fields= 14 a. Construct a bar diagram, and b.
What types of graphs would be appropriate for the following data? Circle as many types as are appropriate and would give clarity to the data. Use the following key:SL = stem-and-leafH = histogramF =
What types of graphs would be appropriate for the following data? Circle as many types as are appropriate and would give clarity to the data. Use the following key:SL = stem-and-leafH = histogramF =
Here are the Fahrenheit temperatures (to the nearest degree) at 3:00 p.m. each day during June for a town in the western part of the United States:a. Construct a stem-and-leaf display.b. Construct a
Here are the numbers of pounds lost in a 3-month period by 25 members of a weight-loss club5, 7, 12, 4, 6, 11, 3, 8, 14, 10, 24, 8, 6, 15, 8, 12, 7, 11, 13, 12, 9, 4, 5, 18, 22a. Construct a stem and
Assume a frequency curve for the following sets of data. What shape will the curve probably take? Use the following key:NO = normalNS = negatively skewedPS = positively skewedBI = bimodalRE =
Morbidly obese women attending the Healthy Weigh diet clinic are weighed at program entry, to the nearest 10 lb. To join, the women must weigh at least 200 lb. Here are the women's weights. Weight
Twenty autistic children in a communication therapy program are scored on the number of times in a given session that they initiate eye contact or direct a comment toward the primary caretaker. Here
Exercise 2 in Module 3 gave the following number of classes each of 32 students missed during the semester for a class meeting on M-W-F.Find the (a) Mode, (b) median (by formula), and (c) mean for
Exercise 4 in Module 3 gave the following number of TV sets in homes. 2, 3, 1, 2, 3, 0, 2, 4, 1, 2, 4, 3, 2, 1, 1, 3, 0, 2, 1, 1, 2, 3, 2, 5, 2 Find the (a) mode, (b) median (ballpark), and (c) mean
Here are the golf scores of 10 golfers.Find the (a) range, (b) variance, and (c) standard deviation of the golf scores. Show your work.
Exercise 2 in Module 3 and Exercise 6 in Module 5 gave the following number of classes each of 32 students missed during the semester for a class meeting on M-W-F.Find the (a) range, (b) variance,
Exercises 4 and 8 in Module 3 required you to create frequency distributions for the number of TV sets in households. Exercise 8 in Module 5 required you to find the mode, median, and mean number of
Exercise 4 in Module 5 required you to find the median number of contacts made by 20 autistic children. Here are those data again. No. of Contacts No. of Children
The mean human gestation period is 266 days. Actual time to delivery is approximately normally distributed with a standard deviation of about 12 days. Marcelle goes into labor and gives birth to a
Bo goes into labor and gives birth to a child 234 days after conception. What percentage of women gives birth. (a) At the same point in pregnancy as or earlier than Bo. (b) At a later point in
The clerks of the traffic courts at three neighboring towns keep track of the number of miles by which convicted speeders drive over the speed limit. The data, which are approximately normally
Luz's IQ is 123. What percentages of people have IQs (a) the same as or lower than Luz's, (b) higher than Luz's, and (c) between the mean and Luz's?
Tara scores 570 on one portion of the SAT. What percentage of people have SAT scores (a) the same as or lower than Tara's, (b) higher than Tara's, and (c) between the mean and Tara's?
Joe stands 67.00 in. tall. What percentage of American men are (a) the same height or shorter than Joe, (b) taller than Joe, and (c) between the mean and Joes' height?
Incoming resident student Eddie Franz lives 107 miles west of the college. What percentage of incoming resident students live (a) in the same town as or west of Eddie, (b) east of Eddie, and (c)
On Test A, add 5 points to every score. Compute the new mean and standard deviation. a. What effect did this change have on the mean? Does this fit with your understanding of the effect of score
On Test B, multiply each score by 3 and then subtract 5 points from every score.a. What effect did these changes have on the mean? Does this fit with your understanding about the effect of score
On Test C, add 10 points to each score and then divide each score by 3. Compute the new mean and standard deviation.a. What effect did these changes have on the mean? Does this fit with your
In which of these outcomes does the addition theorem apply? In which does the multiplication theorem apply? Circle "AT" for addition theorem or "MT" for multiplication theorem.
In which of these outcomes does the addition theorem apply? In which does the multiplication theorem apply? Circle "AT" for addition theorem or "MT" for multiplication theorem.
For which of these events are the outcomes mutually exclusive? Circle "Yes" if the outcomes are mutually exclusive or "No" if the outcomes are not mutually exclusive.
For which of these events are the outcomes mutually exclusive? Circle "Yes" if the outcomes are mutually exclusive or "No" if the outcomes are not mutually exclusive.
A student eats breakfast one out of every two class days (50% of the time). What is the probability that, in the next four class days, this student will eat breakfast a. No times b. At least twice,
You draw six cards from a standard deck of cards. What is the probability thata. Exactly three will be red,b. None will be red, andc. Fewer than four will be red?
Assume a man has a .50 chance of fathering a boy and a .50 chance of fathering a girl. He fathers three children. What is the probability thata. All three will be girls,b. Exactly two will be girls,
A student goes to breakfast one out of every two class days (50% of the time). What is the probability that, in the next five class days, this student will go to breakfast?a. Exactly three daysb. At
You draw nine cards from a standard deck of cards. What is the probability thata. Four or more will be red,b. Exactly two or three will be red,c. Two or fewer will be red, andd. Exactly five will be
Assume that a man has a .50 chance of fathering a boy and a .50 chance of fathering a girl. He fathers six children. What is the probability thata. Two or fewer will be girls,b. Exactly four will be
A student eats breakfast one out of every two class days (50% of the time). What is the probability that, in the next eight class days, this student will eat breakfast?a. Seven days or fewer,b. All
You draw six cards from a standard deck of cards. What is the probability thata. Exactly three will be hearts,b. All six will be hearts,c. Five or more will be hearts, andd. Only one will be a heart?
The same friend discussed in this module who claimed to have special psychic powers now claims to be able to detect disease by mere touch. Seven students in your dorm feel ill. Prior to the students

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