(F) What is the 95% confidence interval of the mean time people wait before

farting in front of a romantic partner.

Animal Research (AR) case study

29. (AR) What percentage of the women studied in this sample strongly agreed

(gave a rating of 7) that using animals for research is wrong?

30. (AR) Use the proportion you computed in #29. Compute the 95% confidence

interval on the population proportion of women who strongly agree that animal

research is wrong.

31. (AR) Compute a 95% confidence interval on the difference between the gender

means with respect to their beliefs that animal research is wrong.

ADHD Treatment (AT) case study

32. (AT) What is the correlation between the participants' correct number of

responses after taking the placebo and their correct number of responses after

taking 0.60 mg/kg of MPH? Compute the 95% confidence interval on the

population correlation.

Weapons and Aggression (WA) case study

33. (WA) Recall that the hypothesis is that a person can name an aggressive word

more quickly if it is preceded by a weapon word prime than if it is preceded by

a neutral word prime. The first step in testing this hypothesis is to compute the

difference between (a) the naming time of aggressive words when preceded by

a neutral word prime and (b) the naming time of aggressive words when

preceded by a weapon word prime separately for each of the 32 participants.

That is, compute an - aw for each participant.

a. (WA) Would the hypothesis of this study be supported if the difference were

positive or if it were negative?

b. What is the mean of this difference score?

c. What is the standard deviation of this difference score?

d. What is the 95% confidence interval of the mean difference score?

Suppose that you take a random sample of 10,000 Americans and find that

1,111 are left- handed. You perform a test of significance to assess whether the

sample data provide evidence that more than 10% of all Americans are lefthanded, and you calculate a test statistic of 3.70 and a p-value of .0001.

Furthermore, you calculate a 99% confidence interval for the proportion of lefthanders in America to be (.103,.119). Consider the following statements: The

sample provides strong evidence that more than 10% of all Americans are lefthanded. The sample provides evidence that the proportion of left-handers in

America is much larger than 10%. Which of these two statements is the more

appropriate conclusion to draw? Explain your answer based on the results of

the significance test and confidence interval.

36. A student wanted to study the ages of couples applying for marriage licenses in

his county. He studied a sample of 94 marriage licenses and found that in 67

cases the husband was older than the wife. Do the sample data provide strong

evidence that the husband is usually older than the wife among couples

the probability that neither will be alive in 20 years . 43. In a high school graduating class of 100 students, 42 studied mathematics. 68 studied psychology, 54 studied history, 22 studied both mathematics and history, 25 studied both mathematics and psychology, 7 studied history and neither mathematics nor psychology, 10 studied all three subjects, and 8 did not take any of the three subjects. If a student is selected at random, find (a) The probability that he takes history and psychology but not mathematics. (b) The probability that if he is enrolled in history, he takes all three subjects. (c) The probability that he takes mathematics only. is 0.4 and the10. We believe that 80% of the population of all Business Statistics students consider statistics to be an exciting subject. Suppose we randomly and independently selected 10 students from this binomial population. a) Find the probability that 4 of the students sampled consider statistics to be an exciting subject. P(x = 4) b) Find # and o for the number of students that consider statistics to be an exciting subject.From past experience, Rebecca estimates that when she is on the college campus, the following probabilities always apply. The probability that Rebecca will study for her Statistics exams is 65%, the probability Rebecca will study for her Economics exams is 50%, and the probability that Rebecca will study for Statistics and Economics is 30%. What is the probability that Rebecca will NOT study for her Statistics exams? Select one: O a. .35 O b. 65 O c. .30 Q d. .50A magazine reported that at the top 50 business schools in a region, students in a semester-long 3-credit Business Statistics course reported an average of 6.7 hours of study per week. Your Bus Stat professor believes that students at Boise State University study fewer hours per week than reported in this study. She plans to conduct a hypothesis test at a 516 level of significance. The prof randomly selected 100 students taking Business Statistics courses at Boise State, and asked the number of hours they study per week. The students' self- reported average was 6.1 hours. What are the appropriate null and alternative hypotheses? Hot pa = 6.1 hours HAW * 6.1 hours How > 6.7 hours HA: us 6.7 hours HoTHE 6.1 hours HAju $ 6.1 hours O Ho: He 6.7 hours HATH