Question

**TV sets**: According to the Nielsen Company, the
mean number of TV sets in a U.S. household in 2013 was 2.24. Assume
the standard deviation is 1.3. A sample of 90 households is
drawn.

A) What is the probability that the sample mean number of TV sets is greater than 2? Round your answer to four decimal places.

B) What is the probability that the sample mean number of TV sets is between 2.5and 3? Round your answer to four decimal places.

C) Find the 30th percentile of the sample mean. Round your answer to two decimal places.

D) Would it be unusual for the sample mean to be less than 2? Round your answer to four decimal places. (is or is not unusual)

E) Do you think it would be unusual for an individual household to have fewer than 2 TV sets? Explain. Assume the population is approximately normal. Round your answer to four decimal places. (would or would not).

Answer #1

TV sets: According to the Nielsen Company, the mean number of TV
sets in a U.S. household in 2013 was 2.24. Assume the standard
deviation is1.1 . A sample of 80 households is drawn. Use the
Cumulative Normal Distribution Table if needed.
A. What is the probability that the sample mean number of TV
sets is greater than 2? Round your answer to four decimal
places.
B. What is the probability that the sample mean number of TV
sets is...

According to Nielsen Media Research, the average number of hours
of TV viewing by adults (18 and over) per week in the United States
is 36.07 hours. Suppose the standard deviation is 9.7 hours and a
random sample of 50 adults is taken.
Appendix A Statistical Tables
a. What is the probability that the sample average
is more than 38 hours?
b. What is the probability that the sample average
is less than 36.5 hours?
c. What is the probability...

According to Nielsen Media Research, the average number of hours
of TV viewing by adults (18 and over) per week in the United States
is 36.07 hours. Suppose the standard deviation is 9.7 hours and a
random sample of 45 adults is taken.
a. What is the probability that the sample
average is more than 38 hours?
b. What is the probability that the sample average
is less than 39.8 hours?
c. What is the probability that the sample average...

According to Nielsen Media Research, the average number of hours
of TV viewing by adults (18 and over) per week in the United States
is 36.07 hours. Suppose the standard deviation is 8.7 hours and a
random sample of 47 adults is taken.
a. What is the probability that the sample
average is more than 36 hours?
b. What is the probability that the sample average
is less than 36.8 hours?
c. What is the probability that the sample average...

According to Nielsen Media Research, the average number of hours
of TV viewing by adults (18 and over) per week in the United States
is 36.07 hours. Suppose the standard deviation is 8.8 hours and a
random sample of 48 adults is taken. Appendix A Statistical
Tables
a. What is the probability that the sample average is more than
35 hours?
b. What is the probability that the sample average is less than
36.6 hours?
c. What is the probability...

According to Nielsen Media Research, the average number of hours
of TV viewing by adults (18 and over) per week in the United States
is 36.07 hours. Suppose the standard deviation is 9.5 hours and a
random sample of 46 adults is taken.
Appendix A Statistical Tables
a. What is the probability that the sample average
is more than 35 hours?
b. What is the probability that the sample average
is less than 36.6 hours?
c. What is the probability...

A certain TV show recently had a share of 65, meaning that
among the TV sets in use, 65% were tuned to that show. Assume
that an advertiser wants to verify that 65% share value by
conducting its own survey, and a pilot survey begins with 8
households having TV sets in use at the time of the TV show
broadcast. Complete parts (a) through (d) below.
Find the probability that all of the households are tuned to the
TV...

Annual income: The mean annual income for people in a certain
city (in thousands of dollars) is 43, with a standard deviation of
23. A pollster draws a sample of 91 people to interview.
(a) What is the probability that the sample mean income is less
than 40? Round the answer to at least four decimal places. The
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of 5
(b) What is the probability that...

A TV show, Lindsay and Tobias, recently had a share of 10,
meaning that among the TV sets in use, 10% were tuned to that
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The Internal Revenue Service reports that the mean federal
income tax paid in the year 2010 was $8040. Assume that the
standard deviation is $5000. The IRS plans to draw a sample of 1000
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A) What is the probability that the sample mean tax is less than
$7900? Round the answer to at least four decimal places.
B) What is the probability that the sample mean tax is between...

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