Question

A simple random sample of ten college freshmen were asked how many hours of sleep they typically got per night. The results were

8.5 |

9.5 |

8 |

6.5 |

7.5 |

9 |

6 |

24 |

8.5 |

9.5 |

Notice that one joker said that he sleeps 24 hours a day.

99% confidence interval for the mean amount of sleep from the remaining values 6.72

**Leave the outlier in and construct the 99% confidence
interval. Round the answers to two decimal places.**

**If the outlier is included the 99% confidence interval
is _____**

Answer #1

Sleeping outlier: A simple random sample of
nine college freshmen were asked how many hours of sleep they
typically got per night. The results were
8.5 24 9 8.5 8 6.5 6 7.5 9.5
Notice that one joker said that he sleeps 24 a day.
(a) The data contain an outlier that is clearly a mistake.
Eliminate the outlier, then construct a 99.9% confidence interval
for the mean amount of sleep from the remaining values. Round the
answers to at...

Sleeping outlier: A simple random sample of
eight college freshmen were asked how many hours of sleep they
typically got per night. The results were:
8.5 7.5 6.5 9 24 6 8.5 8
Notice that one joker said that he sleeps 24 hours a day.
The data contain an outlier that is clearly a mistake. Eliminate
the outlier, then construct a confidence interval for the mean
amount of sleep from the remaining values. Round the answers to two
decimal places....

. At a local university, the professor of sleep would like to
know the mean time a college student sleeps per nite. Ten randomly
selected students were asked how long they slept at night. The mean
time they slept was 7.1 hours, and the standard deviation was 0.78
hour.
a) Find the best point estimate for the true mean time:
______________
b) Find the 95% confidence interval for the population mean:
______________________
c) A second professor believes that the mean...

In order to determine how many hours per week freshmen college
students watch television, a random sample of 25 students was
selected. It was determined that the students in the sample spent
an average of 19.5 hours with a sample standard deviation of 3.9
hours watching TV per week. Please answer the following questions:
(a) Provide a 95% confidence interval estimate for the average
number of hours that all college freshmen spend watching TV per
week. (b) Assume that a...

1. A sample of 61 students at a university were asked how many
hours of sleep they get on weeknights. The sample had a mean of 6.2
hours and a standard deviation of 0.7 hours.
a. Use your calculator to construct a 95% confidence interval
estimate for the mean reported weeknight sleep time among students
at that university. Write a statement (we are...) that interprets
your answer.

A group of 463 first-year college students were asked, “About
how many hours do you study during a typical week?” The mean
response is 15.3 hours. Assume that the study time is normally
distributed with a sample standard deviation of 8.5 hours.
Construct a 99% confidence level interval for the mean study time
of all first-year students.

How much sleep do you get on a typical school night? A group of
10 college students were asked to report the number of hours that
they slept on the previous night with the following results.
7.25, 6.25, 7.5, 7.25, 8.75, 4.75, 8.25, 7.25, 7, 6.25
(a)
Find a 99% confidence interval for the average number of hours that
college students sleep.
_________ to __________
(b)
What assumptions are required in order for this confidence interval
to be valid? (Select...

A class survey in a large class for first-year college students
asked, "About how many hours do you study during a typical week?"
There were 464 responses to the class survey. Suppose that we know
that the study time follows a Normal distribution with standard
deviation
σ = 8.6
hours in the population of all first-year students at this
university.
One student claimed to study 10,000 hours per week (10,000 is more
than the number of hours in a year)....

6) A random sample of high school girls were asked how many
hours per week they use social media. The sample mean of the 25
girls was 9 with standard deviation 2.7. What is the 90% confidence
interval for the true mean for the hours per week high school girls
use social media? Assume the population is normally
distributed.

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