# I need help with 4 Stats questions

Each

problem is worth 10 points.

Be sure to include all

relevant information and computations (hypotheses, test statistic, p-values,

etc.)

**1. Text Pg. 401 #7.69 (a) â (g) **For

part (b), state a clear and unambiguous decision rule for rejecting the null

hypothesis. Use this rule in part (f).** **

**2. Text Pg. 401 #7.70 (a), (b) ** NOTE: The parameter represents the population

proportion of companies NOT having a hotline.

Also note that the sample size in part (b) is different from the one in

part (a). Use **p-values** for both tests. **State**

**your conclusion** in the context of this problem in a clear English

sentence. **Here is**

**part (c)**: Based on your results, comment on whether or not there appears to

be a trend in companies willingness to provide hotlines (compare your

conclusions for each year and then comment).

**3. Text Pg. 401 #7.71 **

Use p=.333. Also, note that

âdiffersâ implies ânot equalâ for an alternative hypothesis. Use **p-values**

for your analysis. **State your conclusion** in the context of this problem in a clear

English sentence.

** **

**4. **

**Text**

**Pg. 402 #7.75 **Be sure to state the hypotheses for

the test. For the observed sample

proportion, use (417+77)/845. Use **p-values** in your analysis. Be

sure to state the hypotheses and the level of significance to be used.

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