If a student scored 86 points on a test where the mean score was 79.2 and the standard deviation was 4.7. The student's z score is _______.Question 9 options: A) 16.85 B) 18.30 C) 0.31 D) 1.45 How many ways can a student select five questions from an exam containing 12 questions, if one of the five must be the last question? Question 13 options: A) 330 B) 7920 C) 40,320 D) 95,040 A gumball machine contains 300 grape flavored balls, 400 cherry flavored balls, and 500 lemon flavored balls. What is the probability of getting 1 grape ball, 1 cherry ball, and 1 lemon ball if each ball was removed and then replaced before choosing the next from the machine?Question 14 options: A) 0.0264 B) 0.0531 C) 0.0347 D) 0.0482 Find the mean of the distribution shown.X 4 6 P(X) 0.36 0.64 Question 15 options: A) 1.64 B) 4.00 C) 5.28 D) 6.00 A coin is tossed 72 times. Find the standard deviation for the number of heads that will be tossed. Question 16 options: A) 36 B) 18 C) 4.24 D) 6.78 In a large bag of marbles, 20% of them are red. A child chooses 4 marbles from this bag. If the child chooses the marbles at random, what is the chance that the child gets exactly three red marbles?Question 17 options: A) 0.026 B) 0.102 C) 0.154 D) 0.032 Find the probability P(z-0.46) using the standard normal distribution.Question 18 options: A) 0.6772 B) 0.3228 C) 0.8228 D) 0.5400 For a normal distribution with a mean of 7 and a standard deviation of 4, the value 13 has a z value ofQuestion 19 options: A) -1.5 B) 1.5 C) 2.5 D) 3.5 A biologist estimates that 80% of the deer in a region carry a certain type of tick. For a sample of 300 deer selected at random, what is the chance that 246 or fewer deer have this tick?Question 20 options: A) 0.864 B) 0.826 C) 0.652 D) 0.174 The average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 1.00 centimeters. If 9 sand dollars are chosen at random for a collection, find the probability that the average diameter of those sand dollars is more than 4.13 centimeters. Assume that the variable is normally distributed.Question 21 options: A) 0.636 B) 0.800 C) 0.364 D) 0.867 A researcher conducted a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample?Question 22 options: A) 35 B) 70 C) 175 D) 875 A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidence?Question 26 options: A) 142 B) 283 C) 566 D) 1132 A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher than $7.58. A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. Find the P-value for the test. Question 27 options: A) 0.4332 B) 0.2734 C) 0.1325 D) 0.0668 At a certain university, the average attendance at basketball games has been 3325. Due to the dismal showing of the team this year, the attendance for the first 8 games has averaged only 2965 with a standard deviation of 735. The athletic director claims that the attendance is the same as last year. What is the test value needed to evaluate the claim?Question 30 options: A) -1.39 B) -2.65 C) -3.07 D) -3.92 A doctor claims that the standard deviation of systolic blood pressure is 12 mmHg. A random sample of 24 patients found a standard deviation of 14 mmHg. Assume the variable is normally distributed. At = 0.01, what are the critical 2 values? Question 31 options: A) 9.262 and 44.181 B) 13.091 and 35.172 C) 13.848 and 36.415 D) 11.524 and 44.314 A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and men. = 0.05, what is an appropriate test value Women Men Sample size 60 50 Mean effectiveness 4.4 3.9 Population variance 3.6 3.6 Question 33 options: A) 3.79 B) 0.36 C) 0.73 D) 1.38 Use Table H from the textbook to find the critical value for a right-tailed F test with = 0.05, d.f.N. = 21, and d.f.D. = 20. Question 34 options: A) 2.12 B) 2.23 C) 2.20 D) 2.16 A car salesman claims that the variance of prices on convertibles is higher than the variance of prices on station wagons. The standard deviation of the list price on 16 convertibles is $6800 and the standard deviation on 24 station wagons is $3900. What should the test value be? Question 35 options: A) 1.74 B) 3.04 C) 2.25 D) 1.53 A medical researcher is interested in whether patients' left arms or right arms are longer. If 10 patients participate in this study, how many degrees of freedom should the researcher use when finding the critical value for a t test?Question 36 options: A) 9 B) 10 C) 18 D) 19 Compute the standard error of the estimate for the data below.X values 56 69 81 94 100 Y values 95 115 137 165 189 Question 37 options: A) 2.40 B) 3.69 C) 5.38 D) 6.48 The prediction interval around y' for a specific x isQuestion 38 options: A) a confidence interval for the true mean value of the y values that correspond to that x. B) the value of y used to calculate the slope of the regression line. C) the interval of values of x used to predict y'. D) the difference between the value of y and the value of x. An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.A B C D F 6 14 22 8 4 Find the critical value. = 0.5 .Question 40 options: A) 9.236 B) 7.779 C) 11.070 D) 9.488 Greg wants to construct a frequency distribution for the political affiliation of the employees at Owen's Hardware Store. What type of distribution would be best? Question 3 options: A) ungrouped B) grouped C) categorical D) cumulative The interquartile range IQR is found by subtracting the mean from the maximum value of a data set. Question 7 options: A) True B) False Chebyshev's theorem can be used to find the minimum percentage of the values in a data set that will fall within a certain distance of the mean. Question 8 options: A) True B) False
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