Question 1 of 36 J1 E Viewr Policies Current Attempt in Progress Prices of a certain item have a distribution that is skewed to the left with outliers in the left tail. Which of the measures of central tendency is the best to summarize this data set? 0 Median 0 Mean 0 Mode Question 3 of 36 - f1 i: 5 2020 randomly selected adults were asked if they think they are nancially better off than their parents. The following table gives the two-way classication of the responses based on the education levels of the persons included in the survey and whether they are nancially better off. the same. or worse off than their parents. Less Than High School High School More Than High School Better off 140 450 420 Same 60 270 110 Worse off 200 300 70 Suppose one adult is selected at random from these 2020 adults. Find the following probabilities. Round your answers to three decimal places. i.P( better off and high school) = 6% more than high school and worse off) = Question4of 36 J1 E You have a drawer that contains 8 single black socks and 4 single navy socks You grab two socks at random one morning, without looking. [Round your answers to 02 decimal places] a) What is the probability that you will get a pair of black socks? The probability is bi What is the probability that you will get a pair of navy socks? The probability is c) What is the probability you will get a mismatched pair? The probability is A Question 5 of 36 > - /1 . .. View Policies Current Attempt in Progress Given that A and Bare two mutually exclusive events, find P( A or B) for the following. P(A) = 0.42 and P(B) = 0.33 P(A or B) = i Question 6 of 36 - /1 E View Policies Current Attempt in Progress How many different outcomes are possible for 7 tosses of a coin? i outcomesQuestion 7 of 36 - /1 E . .. View Policies Current Attempt in Progress A statistical experiment has eight equally likely outcomes that are denoted by 1,2,3,4,5,6,7, and 8. Let event A = {1,4,7,8 } and event B = {1,3,7,6}. The events A and B v mutually exclusive events. Question 8 of 36 - /1 ... Current Attempt in Progress Define the following two events for two tosses of a coin: A: at least one head is obtained B: both tails are obtained Are A and B mutually exclusive events? Are they independent?Question 9 of 36 - 2'1 :2 Select the correct term from each dropdown which corresponds to each denition. V is the collection of all elements whose characteristics are being studied. V is a portion of the population selected for study. v is a sample that represents the characteristics of the population as closely as possible. v is a sampling procedure in which the item selected at each selection is put back in the population before the next item is drawn. v is a sampling procedure in which the item selected at each selection is not put back in the population before the next lection. Question 10 of 36 - !'| E View Policies Current Attempt in Progress Write the null and alternative hypotheses for the following example Determine if the example is a case of a twotailed, a lefttailed, or a righttailed test. To test if the mean number of hours spent working per week by college students who hold jobs is different from 20 hours. 0 H0: J[1:20 hours. H]: yb20 hours, right-tailed test 0 H0: \"=20 hours. H.: ##20 hours, righttailed test 0 H\": ,u 2 20 hours, H]: ##Ziihours'two-tailed test 0 H0: J[1:20 hours. HI: ,u-(ZO hours, left-tailed test 0 Ho: Ju=20 hours, H. : y - H The following data give the prices of seven textbooks randomly selected from a university bookstore. $86 $170 $106 $124 $55 $162 $144 a. Find the mean for these data. Calculate the deviations of the data values from the mean. Is the sum of these deviations zero? Mean = $ Deviation from the mean for $170 =$ Sum of these deviations = $ b. Calculate the range, variance, and standard deviation. [Round your answers to 2 decimal places] Ga\" b. Calculate the range, variance. and standard deviation. [Round your answers to 2 decimal places] Range = $ Variance = Standard deviation = $ - Question 13 of 36 - /1 ... The following data give the numbers of new cars sold at a dealership during a 20- day period. 9 6 12 3 9 10 6 8 8 4 16 10 11 7 7 3 5 9 11 (a) Make a box-and-whisker plot. X 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 16 18 Graph 1 Graph 2 Choose the correct graph number from the table above: (b) Comment on the skewness of the data set: distribution appears to beQuestion 14 of36 _ 11 := View Policies Current Attempt in Progress The president of a university claims that the mean time spent partying by all students at this university is not more than 7 hours per week. A random sample of 40 students taken from this university showed that they spent an average of 8.90 hours partying the previous week with a standard deviation of 2.0 hours. Test at the 2.5% signicance level whether the president's claim is true. 0 The president's claim is false. 0 The president's claim is true. Question '|5 of 36 - 2' 1 i: The following data give the numbers of driving citations received by 12 drivers. 40758710]ll?62 Find the range. variance. and standard deviation. Range = citations Round your answers to two decimal places. Variance = {I'ations2 Standard deviation = citations Question 16 of 36 f 1 E A brochure from the department of public safety in a northern state recommends that motorists should carry 12 items (ashlights, blankets, and so forth) in their vehicles for emergency use while driving in winter. The following data give the number of items out of these 12 that were carried in their vehicles by 15 randomly selected motorists. Find the mean, median, and mode for these data. Round your answers to two decimal places. where appropriate. Mean = items dedian = Mode: items Question 18 of 36 H a: View Policies Current Attempt in Progress Dennis made a 340 on the MI a standardized test with a known normal distribution having a mean of 400 and a standard deviation of 20. Sharon made a 12 on the SCT, another standardized test with a known normal distribution having a mean of 18 and a standard deviation of 3. Who did worse? v Question 20 of 36 H E E Indicate which of the following random variables are discrete and which are continuous. a.The number of new accounts opened at a bank du ring a certain month: V b. The time taken to run a marathon: v c. The price of a concert ticket: v d.The number of rotten eggs in a randomly selected box: v e. The points scored in a football game: v f. The weight of a randomly selected package: V Question 21 of 36 > - /1 E ... View Policies Current Attempt in Progress Let x be a continuous random variable that has a normal distribution with # = 89 and o = 19. Assuming - . .. View Policies Current Attempt in Progress Let x be a continuous random variable that has a normal distribution with # = 75 and o = 13. Assuming - -31 ;: View Policies Current Attempt in Progress The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Find the probability that the mean GPA of a random sample of 20 students selected from this university is 3.07 or higher. Round your answer to four decimal places. PG 2 3.07) 2 Question 24 of 36 _;1 i: 1 View Policies Current Attempt in Progress The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Find the probability that the mean GPA of a random sample of 20 students selected from this university is 2.89 or lower. Round your answer to four decimal places. Pt? S 2.89) 2 ti. coo Question 25 of 36 > - /1 View Policies Current Attempt in Progress Consider Ho: # = 45 versus H1: M _ ,11 a: 090 View Policies Curre nt Attempt in Progress According to an estimate, 2 years ago the average age of all CEOs of medium- sized companies in the United States was 58 years. Jennifer wants to check if this is still true. She took a random sample of 70 such CEOs and found their mean age to be 55 years with a standard deviation of 6 years. Using the 1% signicance level, can you conclude that the current mean age of all CEOs of medium-sized companies in the United States is different from 58 years? Question 27 of 36 _ g 1 ;: View Policies Current Attempt in Progress A real estate agent claims that the mean living area of all single-family homes in his county is at most 2400 square feet. A random sample of 50 such homes selected from this county produced the mean living area of 2598 square feet and a standard deviation of 472 square feet. Using a = 0.05. can you conclude that the real estate agent's claim is true? Question 28 of36 4: > -31 ;: View Policies Current Attempt in Progress A manager is deciding on next year's raises, so she looks at performance review scores. Abigail has had 7 annual reviews, with an average score of 8.5 [out of 10, where 10 is best] with a standard deviation of 0.5. Brian has had 11 performance reviews, and has an average of 8.9 with a standard deviation of 1.1. Is Abigail's performance signicantly worse at a = 0.05 than Brian's? v Question 29 of 36 iii View Policies Current Attempt in Progress A men's clothing store has been getting more requests for tall clothes, and the manager decides to see if the average customer is actually taller. From store records, he knows that the average height of customers ve years ago was 71 inches. He randomly samples 20 customers over the next few days and nds that their average height is 72 inches. with a standard deviation of 3 inches. Is there evidence that this store's customers are taller than they were ve years ago? (Use a = 0.05. ) V Question 32 of 36 _ [1 ;: :I View Policies Current Attempt in Progress The prices of all college textbooks follow a bellshaped distribution with a mean of $180 and standard deviation of $30. Using the empirical rule, nd the percentage of all college textbooks with their prices between $90 to $27\"). Enter the exact answer. % Question 33 of 36 - f'l E View Policies Current Attempt in Progress The following data give the speeds of 13 cars (in mph) measured by radar, travelling on I84. 73 75 69 68 78 69 74 76 72 79 68 77 71 Compute the percentile rank of 75. Round your answer to two decimal places. '36 Question 34 of 36 - l1 :: 000 View Policies Current Attempt in Progress The following data give the money [in dollars] spent on textbooks during the Fall 2015 semester by 35 students selected from a university. 565 728 870 620 349 868 610 765 550 845 530 705 488 263 320 505 957 787 617 721 635 438 575 702 538 720 460 840 890 560 570 706 430 965 639 a. Prepare a stem-and-leaf display for these data using the last two digits as leaves. 2n 4303860" 505 30 38 50 60 65 70 75 6 10 1720 35 39 702 05 06 2O 21 28 65 87 8 4O 45 68 70 90 957\" b. Condense the stem-and-leaf display by grouping the stems as 2-4, 5-6, and 7- 9. 2463 * 2049* 303860\" 56 05 30 38 50 60 65 70 75 + 10 17 20 35 n 790205062021286587'4045687090'57n 4 > Current Attempt in Progress At Jen and Perry Ice Cream Company, the machine that lls 1pound cartons of Top Flavor ice cream is set to dispense 16 ounces of ice cream into every carton. However, some cartons contain slightly less than and some contain slightly more than 16 ounces of ice cream. The amounts of ice cream in all such cartons have a normal distribution with a mean of 16 ounces and a standard deviation of 0.42 ounces. Find the probability that a randomly selected carton contains 16.015 to 16.025 ounces of ice cream. Round your answer to four decimal places. p: Question 36 of 36