Question

You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters has a mean weight of 5.638 grams and a standard deviation of 0.066 gram. Use a single value to estimate the mean weight of all quarters Also find the 95% confidence interval for the average weight of all quarters.

The estimate for the mean of all quarters is__grams (Round to three deci,al as needed) Find the 95% confidence interval for the mean weight of all quarters ___grams<Y<__grams (Round to three decimal places as needed)

Answer #1

A vending machine company must adjust its machines to accept
only quarters with specified weights.
a) How many quarters must be tested if we want to be 99% confident
that the sample mean is within 0.025 grams (g) of the true
population mean for all coins used in the vending machines? Assume
σ =0.068 g.
b) A random sample of 50 quarters yields a mean weight of 5.622 g
and a standard deviation of 0.068 g. Based on this sample;...

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?

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
s=3 grams. How many mice must be weighted so that 95%
confidence interval will have a margin of error 0.5
grams?
(8-Pts)

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.

Assume that you want to construct a 95% confidence interval
estimate of a population mean. Find an estimate of the sample size
needed to obtain the specified margin of error for the 95%
confidence interval. The sample standard deviation is given
below.
Margin of errors=$6,
standard deviation=$22
The required sample size is __

From a random sample of 16 bags of chips, sample mean weight is
500 grams and sample standard deviation is 3 grams. Assume that the
population distribution is approximately normal. Answer the
following questions 1 and 2.
1. Construct a 95% confidence interval to estimate the
population mean weight. (i) State the assumptions, (ii) show your
work and (iii) interpret the result in context of the problem.
2. Suppose that you decide to collect a bigger sample
to be more accurate....

A company that produce soap wants to estimate the mean amount of
the excess weight of soap in a “1000-gram” bottle at a 99%
confidence. The company knows that the standard deviation of the
excess weight in all such soap bottles is 169 grams. How large a
sample should the company select so that the estimate is within 1.5
grams of the population mean?

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