Question

The National Health Statistics Reports described a study in which a sample of 354 one-year-old baby boys were weighed. Their mean weight was 25.8 pounds with standard deviation 5.3 pounds. A pediatrician claims that the mean weight of one-year-old boys is greater than 25 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the α=0.05 level of significance and the P-value method with the TI-84 Plus calculator.

a. state null and alternative hypothesis. what tail is the hypothesis test?

b. Compute the P-value of the test statistic.

c. Determine whether to reject H0. Use the α=0.05 level of significance.

d. State a conclusion

Answer #1

Babies: A sample of 25 one-year-old girls had a mean weight of
24.1 pounds with a standard deviation of 4.3 pounds. Assume that
the population of weights is normally distributed. A pediatrician
claims that the standard deviation of the weights of one-year-old
girls is less than 4 pounds. Do the data provide convincing
evidence that the pediatrician's claim is true? Use the 0.01 level
of significance.

A sample of 249 one-year-old baby boys in the United States had
a mean weight of 24.2 pounds. Assume the population standard
deviation is 4.7 pounds. What is the upper bound of the 90%
confidence interval for the mean lifetime of the
components?

a sample of 279 one year old baby boys in the US had a mean
weight of 25.9 pounds. assume the population standard deviation is
5.9 pounds. what is the upper bound of the 90% confidence interval
for the mean lifetime of the components. round your answer to two
decimal places

In 2013, the Gallup Poll asked 1031 U.S. adults whether they
believed that people should pay sales tax on items purchased over
the internet. Of these, 443 said they supported such a tax. Does
the survey provide convincing evidence that less than 45% of U.S.
adults favor an internet sales tax? Use the α=0.05 level of
significance and the P-value method with the TI-84 Plus
calculator.
a. state null and alternative hypothesis. what tail is the
hypothesis test?
b. Compute...

Children of a certain age are known to have a mean weight of
85 pounds. A complaint is
made that the children living in a municipal home are overfed.
As one bit of evidence, 25
randomly selected children are weighed and found to have a
mean weight of 87 pounds. It is
known that the population standard deviation is 11.6 pounds.
Is there convincing evidence
at 0.05 significance level that mean weight of the children is
greater than 85 pounds?...

The Fair Isaac Corporation (FICO) credit score is used by banks
and other lenders to determine whether someone is a good credit
risk. Scores range from 300 to 850, with a score of 720 or more
indicating that a person is a very good credit risk. An economist
wants to determine whether the mean FICO score is lower than the
cutoff of 720. She finds that a random sample of 60 people had a
mean FICO score of 695 with...

A poll surveyed 341 video gamers, and 109 of them said that they
prefer playing games on a console, rather than a computer or
hand-held device. An executive at a game console manufacturing
company claims that the proportion of gamers who prefer consoles
differs from 30%. Does the poll provide convincing evidence that
the claim is true? Use the α=0.10 level of significance and the
P-value method with the TI-84 Plus calculator
a. state null and alternative hypothesis. what tail...

A random sample of 100 two-month old babies is obtained, and the
mean head circumference is found to be 40.6 cm. Assume that the
population standard deviation is known to be 1.6 cm. Using a
significance level of 0.05, test the claim that the mean head
circumference of all two-month old babies is not equal to
40.0cm.
a.) State the null and alternative hypothesis.
H0:
H1:
b.) State the appropriate test statistic.
c.) Determine the value of the test statistic. (Round...

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.

The mean annual tuition and fees in the 2013-2014
academic year for a sample of 23 private colleges in California was
$38,500 with a standard deviation of $7700. A dotplot shows that it
is reasonable to assume that the population is approximately
normal. Can you conclude that the mean tuition and fees for private
institutions in California is greater than $35,000? Use the α=0.05
level of significance and the P-value method with the TI-84 Plus
calculator.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 17 minutes ago

asked 23 minutes ago

asked 27 minutes ago

asked 29 minutes ago

asked 30 minutes ago

asked 30 minutes ago

asked 32 minutes ago

asked 49 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago