The mean amount spent by a family of four on food is $500 per month with a standard deviation of $75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?

The mean amount spent by a family of four on food is $500 per month with a standard deviation of $75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?
0.1151

0.0362

0.8750

0.2158

As the size of the sample increases, what happens to the shape of the distribution of sample means?
It cannot be predicted in advance.

It is negatively skewed.

It approaches a normal distribution.

It is positively skewed.

What is the following table called?
Ages Number of Ages
20 up to 30 16
30 up to 40 25
40 up to 50 51
50 up to 60 80
60 up to 70 20
70 up to 80 8
Frequency polygon

Frequency distribution

Histogram

Cumulative frequency distribution

How is the t distribution similar to the standard z distribution?
Both are continuous distributions.

Both are skewed distributions.

Both are families of distributions.

Both are discrete distributions.

In a distribution, the second quartile corresponds with the __________.
Median

Variance

Mean

Mode

A random sample of 85 supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?

Explanation & Answer

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