Statistics Hypothesis Testing

The claim being assessed in a hypothesis test

• Null hypothesis

• Alternative hypothesis

• P-Value

• Parameter

When the confidence level is 95%, significance level is equal to:

• 0.5

• 0.10

• 0.01

• 0.05

It is the line that separates the two regions--acceptance region and rejection region.

• z-value

• critical value

• mean value

• computed value

If the null hypothesis is true, what is the correct decision?

• Accept the null hypothesis.

• Reject the null hypothesis.

In a two-tailed test, the rejection region is split and placed in both tails of the sampling distribution.

• TRUE

• FALSE

At the Chrysler manufacturing plant, there is a part that is supposed to weigh precisely 19 pounds. The engineers take a sample of parts and want to know if they meet the weight specifications. What are our null and alternative hypotheses?

• H_o : μ = 17, H_a : μ ≠ 19

• H_o : μ = 19, H_a : μ ≠ 19

• H_o : μ = 19, H_a : μ ≠ 17

• H_o : μ = 17, H_a : μ ≠ 17

Identify the correct null hypothesis:

• H₀: p = 0.50

• H₀: µ = 100

• H₀: p = 0.48

• H₀: µ = 96

Which of the following represents the appropriate null & alternative hypotheses?
The mean height of women is greater than 64"

• H₀: μ > 64"
  Hₐ: μ ≠ 64"

• H₀: μ = 64"
  Hₐ: μ > 64"

• H₀: p > 64"
  Hₐ: p ≠ 64"

• H₀: p = 64"
  Hₐ: p > 64"

In their advertisements, a new diet program would like to claim that their methods result in a mean weight loss of more than ten pounds in two weeks. In order to determine if this is a valid claim, they hire an independent testing agency that then selects twenty-five people to be placed on this diet. The agency should be testing the null hypothesis H₀: m = 10 and the alternative hypothesis

• Ha: μ < 10

• Ha: μ > 10

• Ha: μ ≥ 10

• Ha: μ ≤ 10

Suppose that the present success rate in treating a certain type of lung cancer is .75. A research group hopes to demonstrate that the success rate of a new treatment of this cancer is better. What are the null and alternative hypotheses?

• H_o : p = 0.25, H_a : p > 0.55

• H_o : p < 0.75, H_a : p > 0.35

• H_o : p = 0.75, H_a : p > 0.75

• None of these.