Question

1 . A study of 5,000 American women was taken to determine the mean number of children per household. Samples of 100 were taken by state. The average American household, as reported by women, contains 2.1 children with a standard deviation of 1.87. What would be the mean of the sampling distribution of the sample means? (If rounding is necessary, round to four decimal places).

2 . A study of 5,000 American women was taken to determine the mean number of children per household. Samples of 100 were taken by state. The average American household, as reported by women, contains 2.1 children with a standard deviation of 1.87. What would be the standard error of the sampling distribution of the sample means? (If rounding is necessary, round to four decimal places).

3 . A study of 5,000 American women was taken to determine the mean number of children per household. Samples of 100 were taken by state. The average American household, as reported by women, contains 2.1 children with a standard deviation of 1.87. What is the probability that South Carolina reports having an average of 2.2 or more children?

4 . A company that makes light bulbs claims that its bulbs have an average life of 750 hours with a standard deviation of 20 hours. Random samples of 64 light bulbs are taken. Is it safe to assume that the sampling distribution is approximately normal? Explain.

5 . A company that makes light bulbs claims that its bulbs have an average life of 750 hours with a standard deviation of 20 hours. Random samples of 64 light bulbs are taken. Find the probability that the light bulbs will last between 745 and 755 hours. (If rounding is necessary, round to four decimal places)

Answer #1

A study of 45 American adults was taken and found that the mean
number of times they went to the movies in the past 6 months was
9.2 with standard deviation 1.5. This study was to performed to
determine if this value has changed since 2000 when the mean was 10
every 6 months.
Step 4 of 5: Give your p-value.
Step 5 of 5: State your conclusion and interpretation.

A study of 50 American adults was taken and found that the mean
number of times they went to the movies in the past 6 months was
9.5 with standard deviation 1.6. This study was to performed to
determine if this value has changed since 2000 when the mean was 10
every 6 months.
A)What type of hypothesis test should be performed here?
B) State the null hypothesis. and the the alternative
hypothesis.
C)Give your p-value.
D)State your conclusion and...

Suppose that a study of elementary school students reports that
the mean age at which children begin reading is 5.8 years with a
standard deviation of 0.7 years. (2 pts) Step 1. If a sampling
distribution is created using samples of the ages at which 61
children begin reading, what would be the mean of the sampling
distribution of sample means? Round to two decimal places, if
necessary. (2 pts) Step 2. If a sampling distribution is created
using samples...

A.C. Neilsen reported that children between the ages of two and
five watch an average of 24 hours of television per week with
standard deviation 4.5 hours. If random samples of 9 children
between the ages of two and five were taken repeatedly and the
sample means were computed, the sampling distribution of x
would have a mean of ________________ hours and a standard
deviation of ________________ hours. Explain.

Suppose that a study of elementary school students reports that
the mean age at which children begin reading is 5.4 years with a
standard deviation of 0.7 years.
Step 2 of 2:
If a sampling distribution is created using samples of the ages
at which 37 children begin reading, what would be the standard
deviation of the sampling distribution of sample means? Round to
two decimal places, if necessary.

Suppose that a study of elementary school students reports that
the mean age at which children begin reading is 5.6 years with a
standard deviation of 1.1 years.
Step 2 of 2 :
If a sampling distribution is created using samples of the ages
at which 53 children begin reading, what would be the standard
deviation of the sampling distribution of sample means? Round to
two decimal places, if necessary.

Suppose that a study of elementary school students reports that
the mean age at which children begin reading is 5.3 5.3 years with
a standard deviation of 0.9 0.9 years. Step 2 of 2: If a sampling
distribution is created using samples of the ages at which 33 33
children begin reading, what would be the standard deviation of the
sampling distribution of sample means? Round to two decimal places,
if necessary.

A light bulb manufacturer wants to compare the mean lifetimes of
two of its light bulbs, model A and model B. Independent random
samples of the two models were taken. Analysis of 11 bulbs of model
A showed a mean lifetime of 1361hours and a standard deviation of
83 hours. Analysis of 15 bulbs of model B showed a mean lifetime of
1304 hours and a standard deviation of 81hours. Assume that the
populations of lifetimes for each model are...

According to a study of TV viewing habits, the average number of
hours an American over the age of 2 watches TV per week is 44. The
population standard deviation is 16 hours. If a sample of 64
Americans over the age of 2 are randomly selected, what is the
standard error of the mean?

Do women tend to spend more time on housework than men? If so,
how much more? A study reported the results shown in the table to
the right for the number of hours spent on housework per week.
Complete parts a through d below.
Housework Hours
Gender
Sample Size
Mean
Standard
Deviation
Women
474
30.5
13.7
Men
493
15.0
12.6
A. Based on this study, calculate how
many more hours per week, on the average, women spend on
housework than...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 11 minutes ago

asked 27 minutes ago

asked 35 minutes ago

asked 35 minutes ago

asked 48 minutes ago

asked 52 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago