**Question: ** A recent study indicated that women took an average of 8.6 weeks of unpaid leave from their jobs after the birth of a child. Assume that this distribution follows the normal probability distribution with a standard deviation of 2.0 weeks. We select a sample of 35 women who recently returned to work after the birth of a child. What is the likelihood that the mean of this sample is at least 8.8 weeks?

## Statistics: Z-test – #29535

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**Question: **A medical student surveys adults to determine if gender and seat belt use are independent. Use the 5 steps of hypothesis testing to determine whether gender and seat belt use are independent.

**Seat belt use**
**Gender M**
**F**
Belt
70
60
No belt
30
40

**Question: **A medical student surveys adults to determine if gender and seat belt use are independent. Use the 5 steps of hypothesis testing to determine whether gender and seat belt use are independent.

Seat belt use |
Gender M |
F |

Belt | 70 | 60 |

No belt | 30 | 40 |