STAT 2000 10/31

A __________ gives an interval of plausible values for the _____________. 

• confidence interval, statistic
• point estimate, parameter
• point estimate, statistic
• confidence interval, parameter

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

Falsely rejecting a true null hypothesis is which type of error?

• Type I error

• This is not an error

• Type II error

• Type III error

Tags

CCSS.HSS.IC.B.5

A bowling ball manufacturer has recently received complaints about the weight of her bowling balls. She wants to determine whether her factory is producing bowling balls that are heavier than they should be at a 95% confidence level. Normally, her factory produces balls weighing 13 lbs with a standard deviation of 1.2 lbs. In a sample of 18 bowling balls, the manufacturer finds a mean of 14 lbs. What is the null hypothesis?

• H0: The true mean weight of bowling balls produced at the factory is 14 lbs

• HA: The true mean weight of bowling balls produced at the factory is not 13 lbs

• H0: The true mean weight of bowling balls produced at the factory is 13 lbs

• HA: The true mean weight of bowling balls produced at the factory is 13 lbs

Tags

CCSS.HSS.IC.A.1

A bowling ball manufacturer has recently received complaints about the weight of her bowling balls. She wants to determine whether her factory is producing bowling balls that are heavier than they should be at a 95% confidence level. Normally, her factory produces balls weighing 13 lbs with a standard deviation of 1.2 lbs. In a sample of 18 bowling balls, the manufacturer finds a mean of 14 lbs. What is the alternative hypothesis?

• HA: The true mean weight of the bowling balls is not 13 lbs

• HA: The true mean weight of the bowling balls is 13 lbs

• H0: The true mean weight of the bowling balls is 13 lbs

• H0: The true mean weight of the bowling balls is 14 lbs

Tags

CCSS.HSS.IC.A.1

A bowling ball manufacturer has recently received complaints about the weight of her bowling balls. She wants to determine whether her factory is producing bowling balls that are heavier than they should be at a 95% confidence level. Normally, her factory produces balls weighing 13 lbs with a standard deviation of 1.2 lbs. In a sample of 18 bowling balls, the manufacturer finds a mean of 14 lbs. What is alpha?

• 0.025

• 0.5

• 0.05

• -0.25

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.5

CCSS.HSS.ID.A.4

A bowling ball manufacturer has recently received complaints about the weight of her bowling balls. She wants to determine whether her factory is producing bowling balls that are heavier than they should be at a 95% confidence level. Normally, her factory produces balls weighing 13 lbs with a standard deviation of 1.2 lbs. In a sample of 18 bowling balls, the manufacturer finds a mean of 14 lbs. If we were to construct a confidence interval, would we use a z-based or t-based confidence interval?

• A z-based interval, because n>30

• A t-based interval, because n<30

• A t-based interval, because n>18

• A z-based interval, because n>12

Which of the following R commands will give you a critical z-value for a confidence level of 99%?

• pnorm(0.01, 0.99)

• qnorm(0.01, 0.99)

• pnorm(0.005)

• qnorm(0.005)

Tags

CCSS.HSS.ID.A.4

What happens to the width of a confidence interval as the sample size increases?

• The width increases

• The width decreases

• The width stays the same

Tags

CCSS.HSS.IC.B.4

What happens to the width of a confidence interval as the confidence level increases?

• The width increases

• The width stays the same

• The width decreases

Tags

CCSS.HSS.IC.B.4

A small p-value:

• Allows us to reject the alternative hypothesis

• Is inconclusive

• Allows us to accept the null hypothesis

• Allows us to reject the null hypothesis

Tags

CCSS.HSS.IC.B.5