Stats Unit 5 Review

Identify the correct null hypothesis:

Is the proportion of babies born male different from 50%? In a sample of 200 babies, 96 were male. Test the claim using a level of significance of 1%.

• H₀: p = 0.50

• H₀: µ = 100

• H₀: p = 0.48

• H₀: µ = 96

Suppose the P-value for a hypothesis test is 0.0304. Using a = 0.05, what is the appropriate conclusion?

• a) Reject the null hypothesis

• b) Reject the alternative hypothesis

• c) Fail to reject the null hypothesis

• d) Fail to reject the alternative hypothesis

When p-value is greater than alpha we:

• Reject Ho

• Fail to reject Ha

• Fail to reject Ho

• Reject Ha

If the alternative hypothesis is "not equal to" and you get a test statistic z = 1.56. Which is the correct p-value?

• 0.0594

• Between 0.10 and 0.15

• Between 0.050 and 0.075

• 0.1188

We conclude "Fail to reject H₀". What could we use as our interpretation?

• The proportion of babies born male is not 0.50.
• There is not enough evidence to say that the proportion of babies born male is different from 0.50.
• There is not enough evidence to say that the proportion of babies born male is 0.50.

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"

What type of problem is the following: Test the claim that the average legnth of a male's beard is greater that 3mm. The population standard deviation is 1.1mm.

• Mean (t)

• Mean (z)

• Proportion

• none of these