Home Chapter 3 Self-Study Quizzes Multiple Choice

# Multiple Choice

This activity contains 18 questions.

## Calculate the median value of the following eight numbers: 14, 34, 50, 10, 24, 11, 32, 20.

 22 20 24 24.4

## Calculate the standard deviation of the following sample of size four: 3, 4, 7, 10.

 10 2.74 7.5 3.16

## The least squares method minimizes which of the following?

 Sum of the absolute deviations from the line Sum of the squared deviations from the line The variance in the observed y-values All of the above

## If the sample correlation coefficient rxy is equal to -1.00, then

 all the data points must fall exactly on a straight line when the slope equals 1.00. all the data points must fall exactly on a straight line with a negative slope. all the data points must fall exactly on a straight line with a positive slope. all the data points must fall exactly on a horizontal straight line with a zero slope.

## Calculate the interquartile range of the following 11 numbers: 14, 34, 50, 10, 24, 11, 32, 20, 9, 51, 7.

 10 34 22 34

## The strength of the linear relationship between two numerical variables may be measured by the

 mean. interquartile range. coefficient of variation. correlation coefficient.

## In a simple linear regression problem, rxy and b1

 may have opposite signs. must have the same sign. must have opposite signs. are equal.

## Calculate the covariance of the following sample of four (x, y) pairs: (1, 4), (2, 9), (4, 6), and (5, 9).

 0.438 0.583 0.225 0.842

## Referring to Table 3-1, what is the estimated slope parameter for the candy bar price and sales data?

 161.386 0.784 - 3.810 - 48.193

## Referring to Table 3-1, if the price of the candy bar is set at \$2, the predicted sales will be ________.

 30 65 90 100

## Which of the following statements about the median is NOT true?

 It is more affected by extreme values than the mean. It is a measure of central tendency. It is equal to Q2. It is equal to the mode in bell-shaped distributions.

## In a perfectly symmetrical distribution

 the mean equals the median. the median equals the mode. the mean equals the mode. All the above

## When extreme values are present in a set of data, which of the following descriptive summary measures are most appropriate?

 CV and range Mean and standard deviation Median and interquartile range Mode and variance

## Calculate the correlation coefficient of the following sample of four (x, y) pairs: (1, 4), (2, 9), (4, 6), and (5, 9).

 0.751 0.518 0.225 0.842

## At a highway checkpoint, the average speed of a passing car was measured at 45 miles per hour with a standard deviation of 4 miles per hour. According to Chebychev's Theorem, what percentage of cars would you expect to be traveling between 33 and 57 miles per hour?

 At least 50% At least 75% At least 88.9% At least 99.7%

## Referring to Table 2-3, the mean carbohydrates in this sample is ________ grams.

 15.25 19.73 21.42 21.7

## Referring to Table 2-3, the variance of the carbohydrate amounts is ________ (grams squared).

 5.1 23.65 26.02 31.54

## Which of the following is not part of the five-number summary?

 Q1 Median Q3 Mode