Question
In: Statistics and Probability
Investigators studying exercise habits in different regions of the country surveyed a simple random sample of...
Investigators studying exercise habits in different regions of
the country surveyed a simple random sample of 421 California
adults, age 25 - 35, and an independent simple random sample of 377
Massachusetts adults, age 25 - 35.
Among other observations, the investigators noted that
(i) In the CA sample, the average number of hours/week of
exercise was 7.4, with a standard deviation of 3.3;
(ii) In the MA sample, the average number of hours/week of
exercise was 6.7, with a standard deviation of 3.5.
Based on this data, the investigators concluded that CA adults
(in this age group) exercise more than MA adults (in this age
group).
Use an appropriate test of significance to test the
investigators' claim, at the 5% significance level.
(a) State the formal hypotheses in terms of appropriate
population parameters.
(b) Find the test statistic and the p-value and explain how
you found them (i.e., where the EV and SE come from, what
distribution the test statistic follows, etc.)
(c) Summarize your conclusions in terms of the investigators'
claim.
Solutions
orchestra answered 1 year agoRelated Solutions
Investigators studying exercise habits in different regions of the country surveyed a simple random sample of...
Investigators studying exercise habits in different regions of
the country surveyed a simple random sample of 421 California
adults, age 25 - 35, and an independent simple random sample of 377
Massachusetts adults, age 25 - 35.
Among other observations, the investigators noted that
(i) In the CA sample, the average number of hours/week of exercise
was 7.4, with a standard deviation of 3.3;
(ii) In the MA sample, the average number of hours/week of exercise
was 6.7, with a...
8. If a simple random sample of 215 students was surveyed, and it was found that...
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What percentage of the variation in the proportion of calls
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A public opinion poll surveyed a simple random sample of 550 voters in Oregon. The respondents...
A public opinion poll surveyed a simple random sample of
550 voters in Oregon. The respondents were asked which political
party they identified with most and were categorized by residence.
Results are shown below. Decide if voting preference is independent
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Republican
Democrat
Independent
NW Oregon
85
103
22
SW Oregon
45
66
10
Central Oregon
46
53
9
Eastern Oregon
67
33
11
Enter the test statistic - round to 4 decimal
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A public opinion poll surveyed a simple random sample of 1000 voters. Respondents were classified by...
A public opinion poll surveyed a simple random sample of 1000
voters. Respondents were classified by gender (male or female) and
by voting preference (Republican, Democrat, or Independent).
Results are shown in the contingency table below.
VOTING PREFERENCES
Rep
Dem
Ind Row Total
Male
350
075
25
450
Female
275
240
35
550
Column Total
625
315
60
1000
Is there a gender gap? D3 the men's voting preferences differ
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The researcher surveyed adults about their exercise habits and experience of pain. 120 people responded to...
The researcher surveyed adults about their exercise habits and
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elevated pain, and also based on whether or not the respondent
indicated more versus less exercise.
Less Exercise
More Exercise
Less Pain
24
11
More Pain
46
39
Conduct the 5 step hypothesis testing procedure to answer the
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In a hypothetical country, there are 1,000,000 eligible voters. A simple random sample of size 200...
In a hypothetical country, there are 1,000,000 eligible voters.
A simple random sample of size 200 was chosen to study the
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The results are tabulated as follows.
In order to evaluate the null hypothesis that there is no
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Complete parts (a) through (d) below.
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est=Answer______ (Round to four decimal places as
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A. What is the standard error of the estimate of the proportion
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B. Find the margin of error, using a 95% confidence level,
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C. Report the 95% confidence...
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