Question
A study is made of residents in Phoenix and its suburbs concerning the proportion of residents who subscribe to Sporting News . A random sample
A study is made of residents in Phoenix and its suburbs concerning the proportion of residents who subscribe toSporting News. A random sample of87urban residents showed that9subscribed, and a random sample of97suburban residents showed that16subscribed. Does this indicate that a higher proportion of suburban residents subscribe toSporting News? Use a10%level of significance.
What are we testing in this problem?
single proportion
single mean
paired difference
difference of means
difference of proportions
(a) What is the level of significance?
State the null and alternate hypotheses.
H0:p1=p2;H1:p1>p2
H0:p1<p2;H1:p1=p2
H0:p1=p2;H1:p1p2
H0:p1=p2;H1:p1<p2
(b) What sampling distribution will you use? What assumptions are you making?
The Student'st. The number of trials is sufficiently large.
The standard normal. We assume the population distributions are approximately normal.
The standard normal. The number of trials is sufficiently large.
The Student'st. We assume the population distributions are approximately normal.
What is the value of the sample test statistic? (Test the differencep1p2. Do not use rounded values. Round your final answer to two decimal places.)
(c) Find (or estimate) theP-value. (Round your answer to four decimal places.)
Sketch the sampling distribution and show the area corresponding to theP-value.
(d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Are the data statistically significant at level?
At the= 0.10 level, we reject the null hypothesis and conclude the data are statistically significant.
At the= 0.10 level, we reject the null hypothesis and conclude the data are not statistically significant.
At the= 0.10 level, we fail to reject the null hypothesis and conclude the data are statistically significant.
At the= 0.10 level, we fail to reject the null hypothesis and conclude the data are not statistically significant.
(e) Interpret your conclusion in the context of the application.
There is sufficient evidence at the 0.10 level to conclude that the proportion of suburban residents subscribing toSporting Newsis higher.
There is insufficient evidence at the 0.10 level to conclude that the proportion of suburban residents subscribing toSporting Newsis higher.
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