Question

38. Consider the standard normal distribution and find P (0.48 < Z < 1.6). a. 0.2674 b. 0.6844 c. 0.9452 d. 0.2608 39. Selling prices of copies of a painting average $2500 with a standard deviation of $150. Suppose a random sample of 64 such copies was taken. Find the approximate probability that the mean selling price of the 64 copies (X?) is less than $2537.5. That is, find the value of P (X? < 2537.5). a. 0.8849 b. 0.9772 c. 0.0596 d. 0.0384 40. To determine the mean cost of groceries in a certain city, an identical grocery basket of food is purchased at each store in a random sample of 10 stores. If for this sample the average cost and standard deviation are $48.56 and $1.59 respectively, find a 98% confidence interval estimate for the cost of these groceries in the city. Express confidence interval as: x? ± ME x?. a. $48.56 ± $1.42 b. $48.56 ± $0.45 c. $48.56 ± $1.39 d. $48.56 ± $1.17 41. Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for the student population at UHD with a margin of error equal to 0.2. Assume that the standard deviation of the GPA for the student population is 1.0. a. 9 b. 10 c. 96 d. 97 42. Suppose the nightly rate for a hotel is thought to be bell-shaped and symmetrical with a mean of $72 and a standard deviation of $24. What is the percentage of hotels with rates between $48 and $96? (Hint: Use the Empirical Rule.) a. At least 75 b. At least 89 c. Approximately 68 d. Approximately 95

          38. Consider the standard normal distribution and find P (0.48 < Z < 1.6).
a. 0.2674 b. 0.6844 c. 0.9452 d. 0.2608
39. Selling prices of copies of a painting average $2500 with a standard deviation of $150. Suppose a random sample of 64 such copies was taken. Find the approximate probability that the mean selling price of the 64 copies (X?) is less than $2537.5. That is, find the value of P (X? < 2537.5).
a. 0.8849 b. 0.9772 c. 0.0596 d. 0.0384
40. To determine the mean cost of groceries in a certain city, an identical grocery basket of food is purchased at each store in a random sample of 10 stores. If for this sample the average cost and standard deviation are $48.56 and $1.59 respectively, find a 98% confidence interval estimate for the cost of these groceries in the city. Express confidence interval as: x? ± ME x?.
a. $48.56 ± $1.42
b. $48.56 ± $0.45
c. $48.56 ± $1.39
d. $48.56 ± $1.17
41. Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for the student population at UHD with a margin of error equal to 0.2. Assume that the standard deviation of the GPA for the student population is 1.0.
a. 9 b. 10 c. 96 d. 97
42. Suppose the nightly rate for a hotel is thought to be bell-shaped and symmetrical with a mean of $72 and a standard deviation of $24. What is the percentage of hotels with rates between $48 and $96? (Hint: Use the Empirical Rule.)
a. At least 75 b. At least 89 c. Approximately 68 d. Approximately 95

38. Consider the standard normal distribution and find P (0.48 < Z < 1.6).
a. 0.2674 b. 0.6844 c. 0.9452 d. 0.2608
39. Selling prices of copies of a painting average 2500 with a standard deviation of150. Suppose a random sample of 64 such copies was taken. Find the approximate probability that the mean selling price of the 64 copies (X?) is less than 2537.5. That is, find the value of P (X? < 2537.5).
a. 0.8849 b. 0.9772 c. 0.0596 d. 0.0384
40. To determine the mean cost of groceries in a certain city, an identical grocery basket of food is purchased at each store in a random sample of 10 stores. If for this sample the average cost and standard deviation are48.56 and 1.59 respectively, find a 98% confidence interval estimate for the cost of these groceries in the city. Express confidence interval as: x? ± ME x?.
a.48.56 ± 1.42
b.48.56 ± 0.45
c.48.56 ± 1.39
d.48.56 ± 1.17
41. Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for the student population at UHD with a margin of error equal to 0.2. Assume that the standard deviation of the GPA for the student population is 1.0.
a. 9 b. 10 c. 96 d. 97
42. Suppose the nightly rate for a hotel is thought to be bell-shaped and symmetrical with a mean of72 and a standard deviation of 24. What is the percentage of hotels with rates between48 and 96? (Hint: Use the Empirical Rule.)
a. At least 75 b. At least 89 c. Approximately 68 d. Approximately 95

Added by Kevin M.

Question

Please give Ace some feedback