Question

In a recent reported study, the mean age of laptop users is 34 years with the standard deviation of 15 years. For a sample of randomly chosen users of size n = 100, answer the following questions:

A. What are the mean and standard deviation for the sample mean ages of laptop users?

B. What does the distribution look like?

C. Find the probability that the sample mean age is more than 30 years (the reported mean age of laptop users in this particular study).

Answer #1

in a study reported in the Flurry Blog on Oct. 29, 2012, the
mean age of tablet users was 34 yrs, with a standard deviation of
15 years. Assuming a normal distribution, what is the approximate
probability of picking a random sample of 40 tablet users with a
mean age between 31 and 35 yrs?
.56, between z = +1.27 and -0.42
.56, between z = 31 and 35
.56, between z = -1.27 and +0.42
.56 between z =...

A group 125 of Internet users 50-65 years of age were randomly
chosen and asked to report the weekly number of hours they spend
online. The purpose of the study was to determine whether the mean
weekly number of hours that Internet users in that age group spend
online differs from the mean for Internet users in general, which
is 12.5 (as reported by "The Digital The following information is
available: and average mean weekly hrs spent online for this...

A group 125 of Internet users 50-65 years of age were randomly
chosen and asked to report the weekly number of hours they spend
online. The purpose of the study was to determine whether the mean
weekly number of hours that Internet users in that age group spend
online differs from the mean for Internet users in general, which
is 12.5 (as reported by "The Digital The following information is
available: and average mean weekly hrs spent online for this...

It was reported that 30% of all credit card users in the U.S.
pay their card card bill in full every month.
A random sample of size n=84 credit cards users
is chosen. Which of the following is true regarding the effect of
the increased sample size (from 21 to 84) on the mean and standard
deviation of sampling distribution of pˆp^?

The
lifespan of laptop computers is skewed right with a mean of 5.5
years and a standard deviation of 3.5 years.
If simple random samples of 49 laptop computers are randomly
selected, then what do we know about the distribution of the sample
means? Choose one of the answers below:
A. the distribution is normal
B. the distribution is approximately normal
C. the distribution is exponential

A marketing study was conducted to compare the mean age of male
and female purchasers of a certain product. Random and independent
samples were selected for both male and female purchasers of the
product. It was desired to test to determine if the mean age of all
female purchasers exceeds the mean age of all male purchasers. The
sample data is shown here:
Female: n = 10, sample mean = 50.30, sample standard deviation =
13.215
Male: n = 10,...

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 5.8 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...

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.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 12 minutes ago

asked 21 minutes ago

asked 36 minutes ago

asked 51 minutes ago

asked 53 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago