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1. Brian Vanecek, VP...

1. Brian Vanecek, VP of Operations at Portland Trust Bank, is evaluating the service level provided to walk-in customers. Accordingly, his staff recorded the waiting times for 45 randomly selected walk-in customers, and calculated that their mean waiting time was 15 minutes. If Brian concludes that the average waiting time for all walk-in customers is 15 minutes, he is using a/an ________. (Points : 4)

range estimate

statistical parameter

interval estimate

point estimate

exact estimate

2. Brian Vanecek, VP of Operations at Portland Trust Bank, is evaluating the service level provided to walk-in customers. Accordingly, his staff recorded the waiting times for 64 randomly selected walk-in customers and determined that their mean waiting time was 15 minutes. Assume that the population standard deviation is 4 minutes. The 90% confidence interval for the population mean of waiting times is ________. (Points : 4)

14.27 to 15.73

14.18 to 15.82

9.88 to 20.12

13.86 to 16.14

18.12 to 19.87

3. The normal distribution is used to test about a population mean for large samples if the population standard deviation is known. "Large" is usually defined as _______. (Points : 4)

at least 10

at least 5% of the population size

at least 30

at least 12

at least 100

4. Consider the following null and alternative hypotheses.

Ho: p ³ 0.16

Ha: p 6 inches

the mean diameter is 5

s > 5

n = 60

m < 5

m = 5

8. Restaurateur Denny Valentine is evaluating two sites, Raymondville and Rosenberg, for his next restaurant. He wants to prove that Raymondville residents (population 1) dine out more often than Rosenberg residents (population 2). Denny plans to test this hypothesis using a random sample of 81 families from each suburb. His null hypothesis is __________. (Points : 4)

s12 < s22

m1- 2

p1 – p2 = 0

m1 - m2 = 0

s1 – s2 = 0

9. Lucy Baker is analyzing demographic characteristics of two television programs, COPS

(population 1) and 60 Minutes (population 2). Previous studies indicate no difference in the ages of the two audiences. (The mean age of each audience is the same.) Lucy plans to test this hypothesis using a random sample of 100 from each audience. Her alternate hypothesis is ____________. (Points : 4)

m1 - m2 0

m1 - m2 = 0

m1 - m2 ¹ 0

m1 - m2 = 1

10. Maureen McIlvoy, owner and CEO of a mail order business for wind surfing equipment and supplies, is reviewing the order filling operations at her warehouses. Her goal is 100% of orders shipped within 24 hours. In previous years, neither warehouse has achieved the goal, but the East Coast Warehouse has consistently out-performed the West Coast Warehouse. Her staff randomly selected 200 orders from the West Coast Warehouse (population 1) and 400 orders from the East Coast Warehouse (population 2), and reports that 190 of the West Coast Orders were shipped within 24 hours, and the East Coast Warehouse shipped 372 orders within 24 hours. Maureen's null hypothesis is ____. (Points : 4)

p1 – p2 = 0

m1 - m2 = 0

p1 – p2 > 0

m1 - m2 < 0

m1 - m2 ≥ 0

range estimate

statistical parameter

interval estimate

point estimate

exact estimate

2. Brian Vanecek, VP of Operations at Portland Trust Bank, is evaluating the service level provided to walk-in customers. Accordingly, his staff recorded the waiting times for 64 randomly selected walk-in customers and determined that their mean waiting time was 15 minutes. Assume that the population standard deviation is 4 minutes. The 90% confidence interval for the population mean of waiting times is ________. (Points : 4)

14.27 to 15.73

14.18 to 15.82

9.88 to 20.12

13.86 to 16.14

18.12 to 19.87

3. The normal distribution is used to test about a population mean for large samples if the population standard deviation is known. "Large" is usually defined as _______. (Points : 4)

at least 10

at least 5% of the population size

at least 30

at least 12

at least 100

4. Consider the following null and alternative hypotheses.

Ho: p ³ 0.16

Ha: p 6 inches

the mean diameter is 5

s > 5

n = 60

m < 5

m = 5

8. Restaurateur Denny Valentine is evaluating two sites, Raymondville and Rosenberg, for his next restaurant. He wants to prove that Raymondville residents (population 1) dine out more often than Rosenberg residents (population 2). Denny plans to test this hypothesis using a random sample of 81 families from each suburb. His null hypothesis is __________. (Points : 4)

s12 < s22

m1- 2

p1 – p2 = 0

m1 - m2 = 0

s1 – s2 = 0

9. Lucy Baker is analyzing demographic characteristics of two television programs, COPS

(population 1) and 60 Minutes (population 2). Previous studies indicate no difference in the ages of the two audiences. (The mean age of each audience is the same.) Lucy plans to test this hypothesis using a random sample of 100 from each audience. Her alternate hypothesis is ____________. (Points : 4)

m1 - m2 0

m1 - m2 = 0

m1 - m2 ¹ 0

m1 - m2 = 1

10. Maureen McIlvoy, owner and CEO of a mail order business for wind surfing equipment and supplies, is reviewing the order filling operations at her warehouses. Her goal is 100% of orders shipped within 24 hours. In previous years, neither warehouse has achieved the goal, but the East Coast Warehouse has consistently out-performed the West Coast Warehouse. Her staff randomly selected 200 orders from the West Coast Warehouse (population 1) and 400 orders from the East Coast Warehouse (population 2), and reports that 190 of the West Coast Orders were shipped within 24 hours, and the East Coast Warehouse shipped 372 orders within 24 hours. Maureen's null hypothesis is ____. (Points : 4)

p1 – p2 = 0

m1 - m2 = 0

p1 – p2 > 0

m1 - m2 < 0

m1 - m2 ≥ 0

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