Question

A laboratory scale is known to have a standard deviation of σ = 0.001 gram in repeated weighings. Scale readings in repeated weighings are Normally distributed, with mean equal to the true weight of the specimen. Another specimen is weighed eight times on this scale. The average weight is 4.1602 grams. You want a 99% confidence interval for the true weight of this specimen. The margin of error for this interval will be Group of answer choices

a. smaller than the margin of error for 95% confidence.

b. greater than the margin of error for 95% confidence.

c. about the same as the margin of error for 95% confidence.

Answer #1

The gas mileage for a particular type of car is known to have a
standard deviation σ = 1 mile. For a fixed speed (65 miles/hour)
sixteen cars were tested and found to get an average of 24.3 miles
per gallon. What is the z-test statistic for the null hypothesis
H0: μ = 25 miles per gallon?
a.
-.7 b.
-1.4
c.
-2.8 d. 1.4
If the z-test statistic for H0: μ = 10 yields a
p-value of .03. Should...

Scientists want to estimate the mean weight of mice after they
have been fed a special diet. From previous studies, it is known
that the weight is normally distributed with standard deviation 3
grams. How many mice must be weighed so that a 99% confidence
interval will have a margin of error of 0.5 gram?

Scientists want to estimate the mean weight of mice after they
have been fed a special diet. From previous studies, it is known
that the weight is normally distributed with standard deviation 6
grams. How many mice must be weighed so that a 95% confidence
interval will have margin of error of 0.5 grams?

c. Confidence Interval given the sample standard deviation:
5. Confidence Interval, σ is not known or n<30.
For a group of 20 students taking a final exam, the mean heart
rate was 96 beats per minute and the standard deviation was 5. Find
the 95% confidence interval of the true mean.
e) Find the critical value:
f) Find the margin of error: E =tα/2sn√
g) Find the confidence interval: CI = x−± E.
h) Write the conclusion.

scientists want to estimate the mean weight of mice after they
have been fed a special diet. from previous studies, it is known
that the weight is normally distributed with standard deviation 2
grams. how many mice must be weighed so that a 95% confidence
interval will have margin of error of 0.5 grams. write only an
integer as your as your answer.

scientists want to estimate the mean weight of mice after they
have been fed a special diet period from previous studies that is
known that the weight is normally distributed with standard
deviation 6 grams. How many mice must be weighed so that 95%
confidence interval will have a margin error of 0.5 grams ? Right
only an integer as your answer

Scientists want to estimate the mean weight of mice after they
have been fed a special diet. From previous studies, it is known
that the weight is normally distributed with standard deviation of
5 grams. How many mice must be weighed so that a 95% confidence
interval will have margin of error of 0.5 grams.
Write only an integer as your answer.

The standard deviation of the weights of elephants is known to
be approximately 15 pounds. We wish to construct a 95% confidence
interval for the mean weight of newborn elephant calves. Fifty
newborn elephants are weighed. The sample mean is 244 pounds. The
sample standard deviation is 11 pounds.
Identify the following: x¯ = σ = n =
In words, define the random variables X and X¯.
Construct a 95% confidence interval for the population mean
weight of newborn elephants....

Suppose we know that the population standard deviation for wages
(σ) is $15. A random sample of n = 900 results in a sample mean
wage of $50. (10 points)
Provide 95% confidence interval estimate of µ. Interpret the
result. What is the value of the margin of error?
Provide 90% confidence interval estimate of µ. What is the value
of the margin of error?
Provide 99% confidence interval estimate of µ. What is the value
of the margin of...

The standard deviation of the weights of elephants is known to
be approximately 15 pounds. We wish to construct a 95% confidence
interval for the mean weight of newborn elephant calves. Fifty
newborn elephants are weighed. The sample mean is 244 pounds. The
sample standard deviation is 11 pounds.
Construct a 95% confidence interval for the population mean weight
of newborn elephants. State the confidence interval. (Round your
answers to two decimal places.)
,
Sketch the graph. (Round your answers...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 8 minutes ago

asked 46 minutes ago

asked 48 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 2 hours ago

asked 2 hours ago