Question

suppose that for adults the average amount of time spent watching tv per day is normally distribution with a mean of 42 minutes and a standard devation of 12 minutes.

1) what percent of adults spend less than 30 minutes watching tv per day?

A) .04 B) .08 C) .11 D) .13 E) .16

2) What percent of adults more than 50 minutes watching tv per day?

A) 0.18 B) 0.25 C) 0.45 D) 0.62 E) 0.75

3) what percent of adults spend between 40 and 60 minutes watching tv per day?

A) 0.23 B) 0.37 C)0.50 D) 0.63 E) 0.82

4) if you watch more tv than 90% of adults, how much would you watch? of watching is at the 90th percentile.

A) 27.7 B) 45.9 C) 52.8 D) 55.2 E) 57.4

5) if a random sample of 25 adults is taken, what is the probability that their saw more than 45 minutes watched?

A) 0.29 B) .35 C) .40 D) .45 E) .52

Answer #1

The time spent watching TV per week by middle-school students
has a normal distribution with mean 20.5 hours and standard
deviation 5.5 hours.
(a) Find the percent who watch less than 25 hours per week
(b) Find the percent who watch over 30 hours per week

A researcher wants to determine if the number of minutes spent
watching television per day is independent of gender. A random
sample of 315 adults was selected and the results are shown below.
Is there enough evidence to conclude that the number of minutes
spent watching television per day is related to gender? Find the
P-Value. 0 - 30 mins 30 - 60 mins 60 - 90 mins 90 - over mins Male
25 35 75 45 Female 30 45...

Do female college students spend more time than male college
students watching TV? This was one of the questions investigated by
the authors of an article. Each student in a random sample of 46
male students at a university in England and each student in a
random sample of 38 female students from the same university kept a
diary of how he or she spent time over a three-week period.
For the sample of males, the mean time spent watching...

Do female college students spend more time than male college
students watching TV? This was one of the questions investigated by
the authors of an article. Each student in a random sample of 46
male students at a university in England and each student in a
random sample of 38 female students from the same university kept a
diary of how he or she spent time over a three-week period.
For the sample of males, the mean time spent watching...

The following sample data show
the number of hours per day 12 adults spent in from of screens what
television-related content: 1.3, 4.9, 4.2, 4.8, 7.6, 6.9, 5.4, 2.2,
5.3, 1.8, 2.4, 8.3.
Using α = 0.01 determine if there is sufficient evidence to
show that on average adults spend more than 4 hours per day in
front of screens watching television-related content.
Construct a 99% confidence interval to estimate the average
number of hours per day adults spend in...

The following data show the number of hours per day 12 adults
spent in front of screens watching television-related content.
Complete parts a and b below
1.2, 4.7, 3.7, 4.6, 7.9, 6.6, 5.5, 3.1, 5.3, 1.9, 2.6, 8.7
Construct a 95% confidence confidence interval to estimate the
average number of hours per day adults spend in front of screens
watching television-related content.
The 95% confidence interval to estimate the average number of
hours per day adults spend in front of...

The following data show the number of hours per day 12 adults
spent in front of screens watching television-related content.
Complete parts a and b below. 1.2 4.6 4.1 5.4 7.7 7.4 5.1 3.2 5.6
1.1 2.4 8.9 a. Construct a 90% confidence interval to estimate the
average number of hours per day adults spend in front of screens
watching television-related content. The 90% confidence interval
to estimate the average number of hours per day adults spend in
front of...

on average,e U.S. adults spend 136 minutes per day using social
media. Use a normal distribution with a standard deviation of 14.2
minutes to answer: what is the probability that an adult uses
social media between 120 and 140 minutes a day, what is the
probability that an adult uses social media more than 160 minutes
per day, and how many minutes must an adult spend on social media
in a day to be in the top 5% of all...

An extensive survey in 1970 revealed preschool children spend an
average of 6.3 hours per day watching television. The distribution
of TV times in normal with a population standard deviation of 2
hours. Last year a sample of 100 preschool children had a mean of
5.8 hours of TV watching per day. Test to determine if the average
time preschool children spend watching TV per day has decreased at
the 0.01 significance level.
Part A -
Part B -
Part...

An extensive survey in 1970 revealed preschool children spend an
average of 6.3 hours per day watching television. The distribution
of TV times in normal with a population standard deviation of 2
hours. Last year a sample of 100 preschool children had a mean of
5.8 hours of TV watching per day. Test to determine if the average
time preschool children spend watching TV per day has decreased at
the 0.01 significance level.
Part A -
Part B -
Part...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 21 minutes ago

asked 24 minutes ago

asked 33 minutes ago

asked 34 minutes ago

asked 1 year ago

asked 42 minutes ago

asked 50 minutes ago

asked 50 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago