Question
In: Statistics and Probability
On Feb 24 2014, the Today Show stated that women spend an average of 55 minutes...
On Feb 24 2014, the Today Show stated that women spend an average of 55 minutes a day on their appearance, based on a Today/AOL Ideal to Real Body Image Survey. It is Prof Woo’s impression that college students will take less amount of time to get ready in the morning, since he recalls his days of just rolling out of bed and heading straight to class during his college days. He conducted a survey from his Spring 2017 Stat 2120 class to see if UVa students take less than 55 minutes, on average, to get ready in the morning. Download the morning sp17.xlsx dataset for this homework set. The variable “morning” is the amount of time, in minutes, respondents say they take to get ready in the morning.
Carry out the hypothesis test for this claim. Be sure to state the null and alternative hypotheses, calculate the test statistic, state the degrees of freedom, find the critical value, obtain the p-value, and state a conclusion in context.
Sample mean: 31.04017
Sample Size: 473
Sample Standard Deviation: 14.91318
Solutions
orchestra answered 2 years agoRelated Solutions
On Feb 24 2014, the Today Show stated that women spend an average of 55 minutes...
On Feb 24 2014, the Today Show stated that women spend an
average of 55 minutes a day on their appearance, based on a
Today/AOL Ideal to Real Body Image Survey. It is Prof Woo’s
impression that college students will take less amount of time to
get ready in the morning, since he recalls his days of just rolling
out of bed and heading straight to class during his college days.
He conducted a survey from his Spring 2017 Stat...
The average number of minutes individuals spend on the computer during a day is 134 minutes...
The average number of minutes individuals spend on the computer
during a day is 134 minutes and the standard deviation is 25
minutes. The number of minutes individuals spend on the computer
during a day is normally distributed. If one individual is randomly
selected, find the probability that their average number of minutes
spent on the computer is (Show your work to receive credit):
a) More than 164 minutes
b) Less than 118 minutes
A study indicates that 18- to 24- year olds spend a mean of 145 minutes watching...
A study indicates that 18- to 24- year olds spend a mean of 145 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes. Complete parts (a) through (d) below. a. What is the probability that an 18- to 24-year-old spends less than 115 minutes watching video on his or her smartphone per month? The probability that an 18- to...
A study indicates that 18- to 24- year olds spend a mean of 115 minutes watching...
A study indicates that 18- to 24- year olds spend a mean of
115 minutes watching video on their smartphones per month. Assume
that the amount of time watching video on a smartphone per month is
normally distributed and that the standard deviation is 15 minutes.
Complete parts (a) through (d) below.
a. What is the probability that an 18- to 24-year-old spends
less than
95 minutes watching video on his or her smartphone per
month?
(Round to four decimal...
A study indicates that 18- to 24- year olds spend a mean of 115 minutes watching...
A study indicates that 18- to 24- year olds spend a mean of
115 minutes watching video on their smartphones per month. Assume
that the amount of time watching video on a smartphone per month is
normally distributed and that the standard deviation is 10 minutes.
Complete parts (a) through (d) below.
a. What is the probability that an 18- to 24-year-old spends
less than 100 minutes watching video on his or her smartphone per
month?
b.What is the probability...
A study indicates that 18- to 24- year olds spend a mean of 135 minutes watching...
A study indicates that 18- to 24- year olds spend a mean of
135 minutes watching video on their smartphones per month. Assume
that the amount of time watching video on a smartphone per month is
normally distributed and that the standard deviation is 20
minutes.
a.
What is the probability that an 18- to 24-year-old spends less
than 95 minutes watching video on his or her smartphone per
month?
b.
What is the probability that an 18- to 24-year-old...
A study indicates that 18- to 24- year olds spend a mean of 140140 minutes watching...
A study indicates that 18- to 24- year olds spend a mean
of
140140
minutes watching video on their smartphones per month. Assume
that the amount of time watching video on a smartphone per month is
normally distributed and that the standard deviation is
1515
minutes. Complete parts (a) through (d) below.
a.
What is the probability that an 18- to 24-year-old spends less
than
120120
minutes watching video on his or her smartphone per month?The
probability that an 18-...
Question 3. It takes an average of 55 minutes to fly from YYZ to New York’s...
Question 3.
It takes an average of 55 minutes to fly from YYZ to New York’s JFK
airport, averaged across all airlines. The variance of all flights
is 49 minutes. Sixty percent of passengers tend to be male.
3a. A new airline is hoping to reduce this flight time. They
will use the same variance and standard deviation as its measure of
variability. Explain why this is a statistically valid method.
3b. It takes an average of 58 minutes to...
Zingo's Grocery store claims that customers spend an average of 5 minutes waiting for service at...
Zingo's Grocery store claims that customers spend an average of
5 minutes waiting for service at the stores deli counter. A random
sample of 45 customers was timed at the deli counter, and the
average service time was found to be 5.75 minutes. Historically the
standard deviation for waiting time is 1.75 minutes per
customer.
a. Find the 95% confidence interval for
the mean time that customers wait at the deli counter.
b. Is there sufficient evidence to...
Zingo's Grocery store claims that customers spend an average of 5 minutes waiting for service at...
Zingo's Grocery store claims that customers spend an average of
5 minutes waiting for service at the stores deli counter. A random
sample of 45 customers was timed at the deli counter, and the
average service time was found to be 5.75 minutes. Historically the
standard deviation for waiting time is 1.75 minutes per
customer.
a. Find the 95% confidence interval for
the mean time that customers wait at the deli counter.
b. Is there sufficient evidence to...
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