 # QNT 351 Week 5 Final Exam

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QNT 351 Week 5 Final Exam

1. How is the t distribution similar to the standard z distribution?

Both are families of distributions.

Both are skewed distributions.

Both are discrete distributions.

Both are continuous distributions.

1.  The mean of a normal probability distribution is 500 and the standard deviation is 10. About 95% of the observations lie between what two values?

350 and 650

475 and 525

480 and 520

400 and 600

1. As the size of the sample increases, what happens to the shape of the distribution of sample means?

It is positively skewed.

It cannot be predicted in advance.

It approaches a normal distribution.

It is negatively skewed.

1. The names of the positions in a corporation, such as chief operating officer or controller, are examples of what type of variable?

Interval

Qualitative

Quantitative

Ratio

1. Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The results showed that the mean tread life was 50,000 miles, with a standard deviation of 3,500 miles. What is the best estimate of the mean tread life in miles for the entire population of these tires?

500

3,500

35

50,000

1. The National Center for Health Statistics reported that of every 883 deaths in recent years, 24 resulted from an automobile accident, 182 from cancer, and 333 from heart disease. What is the probability that a particular death is due to an automobile accident?

182/883 or 0.206

539/883 or 0.610

24/333 or 0.072

24/883 or 0.027

1. Which of the following is true regarding the normal distribution?

The points of the curve meet the x-axis at z = -3 and z = 3.

The mean, median, and mode are all equal.

It is asymmetrical.

It has two modes.

1. The following graph is a:

Stem-and-leaf display

Dot plot

Contingency table

Box plot

1. Judging from recent experience, 5% of the computer keyboards produced by an automatic, high-speed machine are defective. If six keyboards are randomly selected, what is the probability that none of the keyboards are defective? Use binomial distribution.

1. The members of each basketball team wear numbers on their jerseys. What scale of measurement are these numbers considered?

Ratio

Interval

Ordinal

Nominal

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