Unit 7 and 8 Review

A sports publication states that 32% of married men cannot watch football games because their wives prevent it.  You think that this is untrue.  What is your null hypothesis?

• The proportion of married men who cannot watch football because their wives prevent it is 0.32.
• The proportion of married men who cannot watch football because their wives prevent it is greater than 0.32.
• The proportion of married men who cannot watch football because their wives prevent it is less than 0.32.
• The proportion of married men who cannot watch football because their wives prevent it is not 0.32.

The p-value of a hypothesis test is .0281.  Is this result significant at the 5% significance level?

• Yes, because .0281 > .05.
• Yes, because .0281 < .05.
• No, because .0281 < .05.
• No, because .0281 > .05.

The p-value of a hypothesis test is .0281. Is this result significant at the 1% significance level?

• Yes, because .0281 > .01.
• No, because .0281 > .01.
• No, because .0281 < .01.
• Yes, because .0281 < .01.

Find the critical value(s) for a test using the following hypotheses and a 5% significance level.

• Z* = -1.960
• Z* = -1.645
• Z* = 1.645
• |Z*|= 1.645

Find the critical value(s) for a test using the following hypotheses and a 10% significance level.

• |Z*|= 1.282
• Z*= -1.645
• |Z*|= 1.645
• Z*= -1.282

When do you use a t-value instead of a z-value? 

• When n < 30
• When n ≥ 30
• When all of the planets align
• When Ms. O said to

Tags

CCSS.HSS.ID.A.4

What is it called when something is unlikely to happen by chance alone?

• statistically significant
• alpha
• confidence level
• probability

About 76% of college professors said that if they could pick a career over again, they would choose to be a professor again. A random sample of 59 college professors in Colorado showed that 47 claim they would choose college teaching again. Does this indicate the proportion of professors in Colorado who would choose the career again is greater than the national rate of 76%? Use a 1% level of significance. 

• Do not reject H₀ (z = 0.76)
• Reject H₀ (z = 1.45)
• Do not reject H₀ (z = 1.45)
• Reject H₀ (z = 0.6)

Tags

CCSS.HSS.IC.B.4

A sample of 33 bricks is weighed. The mean weight of each brick is 8.5 pounds with a standard deviation of 0.4 pounds. Identify the p-value given H₀: μ = 8.6, H_A: μ < 8.6

• p = .0755

• p = .0415

• p = .0803

• p = .1606

• p = .9197

Only about 20% of people who try to quit smoking succeed. Sellers of a motivational tape claim that listening to their recorded messages can help people quit. What is the alternative hypothesis?

• p = 0.2
• p = 0.25
• p < 0.2
• p > 0.2