Question

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;
construct a 99% confidence interval estimate of all quarters in
circulation

Answer #1

3. Weights of quarters are normally distributed with a mean of
5.67 g and a standard deviation of 0.06 g. Some vending machines
are designed so that you can adjust the weights of quarters that
are accepted. If many counterfeit coins are found, you can narrow
the range of acceptable weights with the effect that most
counterfeit coins are rejected along with some legitimate
quarters.
3. a) If you adjust your vending machines to accept
weights between 5.60 g and 5.74...

3. Weights of quarters are normally distributed with a mean of
5.67 g and a standard deviation of 0.06 g. Some vending machines
are designed so that you can adjust the weights of quarters that
are accepted. If many counterfeit coins are found, you can narrow
the range of acceptable weights with the effect that most
counterfeit coins are rejected along with some legitimate
quarters.
3. a) If you adjust your vending machines to accept
weights between 5.60 g and 5.74...

How do you do this on a ti-84 calculator?
Weights of quarters are normally distributed with a mean of 5.67
g and a standard deviation of 0.06 g. Some vending machines are
designed so that you can adjust the weights of quarters that are
accepted. If many counterfeit coins are found, you can narrow the
range of acceptable weights with the effect that most counterfeit
coins are rejected along with some legitimate quarters.
3. a) If you adjust your vending machines...

How do you do this on a ti-84 calculator?
Weights of quarters are normally distributed with a mean of 5.67
g and a standard deviation of 0.06 g. Some vending machines are
designed so that you can adjust the weights of quarters that are
accepted. If many counterfeit coins are found, you can narrow the
range of acceptable weights with the effect that most counterfeit
coins are rejected along with some legitimate quarters.
3. a) If you adjust your vending machines...

Vending machines can be adjusted to reject coins above and below
certain weights. The weights of legal U.S. quarters are normally
distributed with a mean of 5.67 grams and a standard deviation of
0.0700 gram
The vending machine is adjusted to reject quarters that weigh
more than 5.80 grams and less than 5.52 grams, what percentage of
legal quarters will be accepted by the machine?

After 1964, quarters were manufactured so that the weights had a
mean of 5.67 g and a standard deviation of 0.06 g. Some vending
machines are designed so that you can adjust the weights of
quarters that are accepted. If many counterfeit coins are found,
you can narrow the range of acceptable weights with the effect that
most counterfeit coins are rejected along with some legitimate
quarters. If you adjust vending machines to accept weights between
5.64 g and 5.70...

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