Question

The mean height of a sample of 15-year-old boys is 175 centimeters, with a standard deviation of 10. For a sample of 15-year-old girls, the mean is 165 centimeters with a standard deviation of 8.

If 8 boys and 8 girls were sampled, the standard deviation of the difference is ___. (Round your answer to the nearest hundredth.)

Answer #1

any query, please ask

A. If the population mean height for
3-year-old boys is 37 inches. Suppose a random sample of 15
3-year-old boys from Country B showed a sample mean of 36.1 inches
with a standard deviation of 2 inches. The boys were independently
sampled. Assume that heights are Normally distributed in the
population.
a. Determine whether the population mean for Country B boys is
significantly different from the Country A mean. Use a significance
level of 0.05.
Find the test statistic t =...

In Country A, the population mean height for 3-year-old boys
is 37 inches. Suppose a random sample of 15 3-year-old boys from
Country B showed a sample mean of 36.8 inches with a standard
deviation of 4 inches. The boys were independently sampled. Assume
that heights are Normally distributed in the population. Complete
parts a through c below. a. Determine whether the population mean
for Country B boys is significantly different from the Country A
mean. Use a significance level...

The average height of 15-year-old girls is 63.8 inches, with a
standard deviation of 2.66 inches. A teacher surveys her class of
thirty-three 15-year-old girls and finds an average height of 62.6
inches. What is the percentile rank for this sample? BTW the answer
is not 32.64%.

The mean height of adult men is about 175 centimeters (cm) with
standard deviation 7 cm. The mean height of adult women is about
160 cm with standard deviation 6 cm.
If a man and a woman are both 166.5 cm tall, which person’s
height is more rare with respect to other people of the same sex?
How do you know?
8. Public health statistics indicate that 26% of adults in the
US smoke cigarettes.
(a) Sketch the sampling distribution...

the
mean weight for 6 year old american boys is about 50 with a
standard deviation of 8 pounds. for 13 year old boys mean is about
95 pounds with a standard deviation of 15 pounds. assume the
weights are distributed nornally for thjs problem. what is the
probability that two random 6 year old boys will together weigh
more than a random thirteen year ild boy?

In Country A, the population mean height for 3-year-old boys is
39 inches. Suppose a random sample of 15 3-year-old boys from
Country B showed a sample mean of 38.4 inches with a standard
deviation of 4 inches. The boys were independently sampled. Assume
that heights are Normally distributed in the population.
Reject or do not reject Upper H 0 . Choose the correct answer
below.
A. Reject Upper H 0 . The population mean is definitely not 39
in....

Assume that the heights of 5-year-old females is normally
distributed with a population mean height of all 5-year-old
females is 42.2 anda standard deviation of 3.13.
What is the mean and the standard deviation of the sample mean
of 10 girls? (Round to 4 decimal places)
Find the probability that the mean height of 10 girls is greater
than 45 inches. (Round to 4 decimal places) Input the StatCrunch
output in SHOW YOUR WORK.

Mean and Standard Deviation of Boys or Girls
Worldwide, the proportion of babies who are girls is about 0.49 .
Let the random variable X represent the number of girls in
fivechildren. Find the mean and standard deviation of this random
variable.
Enter the exact answer for the mean, and round your answer for the
standard deviation to three decimal places.
μ=
sd=

The heights of 11-year old boys in the United States are
normally distributed. A random sample of 9 boys
was taken and their mean height (in inches) was 56.67 and their
sample standard deviation was 3 inches. Perform a
hypothesis test at the 10% significance level to determine if the
mean height of 11-year old boys is more than 54
inches. Give the hypotheses, test statistic, rejection
region, P-value, decision, and interpretation.

A parent believes that the average height for 14 year old girls
differs from that of 14 year old boys. The summary data are listed
below where height is in feet: the sample mean of 5.1 and the
population standard deviation of 0.2 based on a random sample of
size 40 from 14 year old girls. What are the point estimate and the
margin of error with 95% confidence level?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 5 minutes ago

asked 28 minutes ago

asked 50 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago