Katie Sr Yr Stats final practice set 7 (problem14)

Hypotheses - What are the null and alternative hypotheses?

• H0:μ1=μ2,H1:μ1>μ2

• H0:μ1=μ2,H1:μ1≠μ2

• H0:μ1>μ2,H1:μ1=μ2

• H0:μ1μ2

Type of Test - Which test is appropriate to use?

• Paired t-test

• 2-proportion z-test

• 2-sample t-test (Welch’s)

• 1-sample t-test

Test Statistic - What is the test statistic?

• 2.31

• 3.87

• 1.95

• 4.22

P-value - What is the P-value?

• 0.0062

• 0.0379

• 0.0002

• 0.0521

Decision - What is the correct decision?

• Reject H0

• Fail to reject H0

• Raise the significance level to 0.10

• Cannot decide without sample means

Conclusion - What is the correct conclusion?

• There is strong evidence that Factory A bottles contain more soda on average.

• There is strong evidence that Factory B bottles contain more soda on average.

• There is no significant difference in the mean fill level.

• The result is inconclusive.

Hypotheses - What are the null and alternative hypotheses?

• H0:μ1=μ2,H1:μ1>μ2

• H0:μ1=μ2,H1:μ1μ2,H1:μ1=μ2

Type of Test - Which test is appropriate to use?

• Chi-square test for variance

• 1-sample t-test

• 2-sample t-test (Welch’s)

• 2-proportion z-test

Test Statistic - What is the test statistic?

• 2.14

• 3.38

• 1.74

• 2.77

P-value - What is the P-value?

• 0.0011

• 0.025

• 0.072

• 0.014