Question

A study conducted a few years ago claims that the adult males spend an average of 11 hours a week watching sports on television. A recent sample of 100 adult males showed that the mean time they spend per week watching sports on television is 9.50 hours with a standard deviation of 2.2 hours.

a. Use the result to give a 95% confidence interval for the mean time they spend per week watching sports on television.

a. Does the study give good evidence that all adult males spend less than 11 hours per week watching sports on television? (Hint: apply the 4-step process of hypothesis testing)

Answer #1

A survey of 20 randomly selected adult men showed that the mean
time they spend per week watching sports on television is 9.34
hours with a standard deviation of 1.34 hours.
Assuming that the time spent per week watching sports on
television by all adult men is (approximately) normally
distributed, construct a 90 % confidence interval for the
population mean, μ .
Round your answers to two decimal places.
Lower bound: Enter your answer; confidence interval, lower
bound
Upper bound:...

A social scientist claims that the average adult watches 26
hours of television per week. He collects data on 35 individuals’
television viewing habits and finds that their mean number of hours
watching television was 23.4 hours and standard deviation is 8
hours. (Show steps: NULL and ALTERNATIVE HYPOTHESIS, summarize data
into a single TEST STATISTIC, likelihood of the test statistic
would be if NULL is true using test statistic or p-value approach;
decision about NULL and CONCLUSION about the...

A sociologist claims that children ages 3 - 12 spent more mean
time watching television in 1981 than children ages 3 - 12 do
today. A study was conducted in 1981 and a similar study was
recently conducted. At
alphaα
= 0.025, can you support the sociologist's claim?
Sample 1
Sample 2
1981 Study
2.5
2.1
2.3
Recent Study
1.9
2.0
1.6
1.6
2.6
2.1
1.5
2.1
2.3
2.2
1.0
1.9
1.6
1.8
0.9
Hypotheses
What are the null and...

A sociologist claims that children spent more time watching
television in 1981 than children do today. A study was conducted in
1981 to find the time that children watched television on weekdays.
Recently, a similar study was conducted. The results of these
studies (in hours per weekday) are shown below. Assume the
population standard deviation is 0.8 for 1981 and 0.6 for today. At
α=0.05, can you support the sociologist's claim? Complete parts (a)
through (d) below.
1981
1981
2.5...

A sociologist claims that children spent more time watching
television in 1981 than children do today. A study was conducted in
1981 to find the time that children watched television on weekdays.
Recently, a similar study was conducted. The results of these
studies (in hours per weekday) are shown below. Assume the
population standard deviation is 0.7 for 1981 and 0.7 for today. At
Î±=0.05, can you support the sociologist's claim?
Complete parts (a) through (d) below.
1981
3.2
1.4...

A nationwide study a few years ago showed that American women,
ages 19-30, consume an average of 110 milligrams of caffeine per
day. Recently a group of Stats students decided to test whether the
average was more than that now. They obtained a random sample of 25
American women, ages 19-30, whose average daily consumption was 115
milligrams of caffeine per day. The standard deviation was s = 14,
and a histogram was unimodal and nearly symmetric with no outliers....

A nationwide study a few years ago showed that American women,
ages 19-30, consume an average of 110 milligrams of caffeine per
day. Recently a group of Stats students decided to test whether the
average was more than that now. They obtained a random sample of 25
American women, ages 19-30, whose average daily consumption was 115
milligrams of caffeine per day. The standard deviation was s = 14,
and a histogram was unimodal and nearly symmetric with no outliers....

A nationwide study a few years ago showed that American women,
ages 19-30, consume an average of 110 milligrams of caffeine per
day. Recently a group of Stats students decided to test whether the
average was more than that now. They obtained a random sample of 25
American women, ages 19-30, whose average daily consumption was 115
milligrams of caffeine per day. The standard deviation was s = 14,
and a histogram was unimodal and nearly symmetric with no outliers....

A graduate student believed that, on the average, college
students spend more time on the Internet compared to the rest of
the population. She conducted a study to determine if her
hypothesis was correct. The student randomly surveyed 25 students
and found that the average amount of time spent on the Internet was
11.75 hours per week with a SD = 1.5 hours. The last census found
that, on the average, people spent 11 hour per week on the
Internet....

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