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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...
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 α = 0.01, what are the critical χ2 values? 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) 0.867A 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 α = 0.01, what are the critical χ2 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 Use Table H from the textbook to find the critical value for a right-tailed F test with α = 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 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.
