# 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

âdiffersâ implies ânot 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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