Question
In: Statistics and Probability
According to a marketing website, adults in a certain country average 5454 minutes per day on...
According to a marketing website, adults in a certain country average 5454 minutes per day on mobile devices this year. Assume that minutes per day on mobile devices follow the normal distribution and has a standard deviation of 1212 minutes. Complete parts a through d below.
A. What is the probability that the amount of time spent today on mobile devices by an adult is less than 63 minutes?
(Round to four decimal places as needed.)
B. What is the probability that the amount of time spent today on mobile devices by an adult is more than 42 minutes?
(Round to four decimal places as needed.)
C. What is the probability that the amount of time spent today on mobile devices by an adult is between 32 and 49 minutes?
(Round to four decimal places as needed.)
D. What amount of time spent today on mobile devices by an adult represents the 85th percentile?
(Round to two decimal places as needed.)
Solutions
orchestra answered 1 year agoRelated Solutions
According to a marketing website, adults in a certain country average 61 minutes per day on...
According to a marketing website, adults in a certain country
average 61 minutes per day on mobile devices this year. Assume that
minutes per day on mobile devices follow the normal distribution
and has a standard deviation of 11 minutes. Complete parts a
through d below.
a. What is the probability that the amount of
time spent today on mobile devices by an adult is less than 70
minutes?
(Round to four decimal places as needed.)
b. What is the...
b) According to a certain survey, adults spend 2.35hours per day watching television on a weekday....
b) According to a certain survey, adults spend 2.35hours per
day watching television on a weekday. Assume that the standard
deviation for "time spent watching television on a weekday" is
1.93 hours. If a random sample of 50 adults is obtained, describe
the sampling distribution of x overbar, the mean amount of time
spent watching television on a weekday.
d) One consequence of the popularity of the Internet is that it
is thought to reduce television watching. Suppose that a...
Do US adults consume an average of more than 75 grams of fat per day? According...
Do US adults consume an average of more than 75 grams of fat per
day? According to a study of 600 adults in a scientifically
designed study, the sample mean was 77.23 grams with sample
standard deviation 33.47 grams. Do all the steps of a hypothesis
test using normal theory methods, including finding the p-value,
and write the conclusion in context.
According to a certain website, the average height for an adult female is 65 inches with...
According to a certain website, the average height for an adult
female is 65 inches with a standard deviation of 3.5 inches. Ask 15
people of that gender for their height. (population mean is 63.5
inches from survey of 15 females)
a) What is the null hypothesis and what is the alternative
hypothesis?
b) Which test statistic should be used? Why?
c) Perform the appropriate hypothesis test using an alpha level
of 0.05. You can use either a p-value or...
According to a travel website, workers in a certain country lead the world in vacation days,...
According to a travel website, workers in a certain country lead
the world in vacation days, averaging 21.98 days per year. The
following data show the number of paid vacation days for a random
sample of 20 workers from this country. Complete parts a through c
below.
88
44
88
66
1919
2222
1818
2222
1919
2727
2020
3030
2929
1616
3232
2929
3434
3434
3636
6262
a.
Construct a 90 % confidence interval to estimate the average
number of...
According to a travel website, workers in a certain country lead the world in vacation days,...
According to a travel website, workers in a certain country
lead the world in vacation days, averaging
22.06 days per year. The following data show the number of paid
vacation days for a random sample of 20
workers from this country. Complete parts a through c below.
55
55
1010
44
1818
1616
2525
2525
2424
3333
1515
2929
2626
2424
3131
3535
2929
3232
4343
5959
a.a.
Construct a 99% confidence interval to estimate the average
number of paid...
According to a travel website, workers in a certain country lead the world in vacation days,...
According to a travel website, workers in a certain country
lead the world in vacation days, averaging 24.07 days per year.
The following data show the number of paid vacation days for a
random sample of 20 workers from this country.
9,19,5,26,2,25,8,20,18,35,23,31,24,27,30, 34,15,43,33,63
Construct a
90
%
confidence interval to estimate the average number of paid vacation
days for workers from this country.
The 90% confidence interval to estimate the average number of
paid vacation days for workers from this...
According to a survey, people in a certain country ate an average of 211 meals in...
According to a survey, people in a certain country ate an
average of 211 meals in restaurants in 2001. The data in the
accompanying table show the number of meals eaten in restaurants as
determined from a random sample of people in this country in 2009.
Complete parts (a) through (d) below.
Table: 214
128
200
356
145
81
176
323
59
205
159
332
88
218
257
298
235
318
210
168
Determine test statistic, p value, conclusion etc.
According to a survey, people in a certain country ate an average of 212 meals in...
According to a survey, people in a certain country ate an
average of 212 meals in restaurants in 2001. The data in the
accompanying table show the number of meals eaten in restaurants as
determined from a random sample of people in this country in 2009.
Using alpha equals =0.02. Test the hypothesis that the number of
meals eaten at restaurants by people in this country has not
changed since 2001.
Determine the test statistic....???
Data Table:
202 134 199...
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
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