Posted: April 20th, 2016

A sample of 50 breakfast customers of MacDonald s showed the spending below. Which statement is least likely to be correct?

1. A sample of 50 breakfast customers of MacDonald s showed the spending below. Which statement is least likely to be correct?
A) The median is very close to the midhinge.
B) A typical customer spends a little less than $5.
C) About 75 percent of the customers spend less than $7.
D) The trimmed mean would be an unattractive measure of central tendency.
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2.
VenalCo Market Research surveyed 50 individuals who recently purchased a certain CD, revealing the age distribution shown below. Which statement is least defensible?
A) The mean age probably exceeds the median age.
B) The mode would be a reasonable measure of central tendency.
C) The data are somewhat skewed to the left.
D) The CD is unlikely to appeal to retirees.
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3.
In the following data set {7, 5, 0, 2, 7, 15, 5, 2, 7, 18, 7, 3, 0} a score of 7 is
A) the mean.
B) the mode.
C) the median.
D) the mean and the mode.
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4.
Three randomly chosen Michigan students were asked how many round trips they made to Canada last year. Their replies were 3, 4, 5. The geometric mean is
A) 3.877
B) 4.000
C) 4.422
D) 3.915
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5.
Three randomly chosen Colorado students were asked how many times they went rock climbing last month. Their replies were 5, 6, 7. The standard deviation is
A) 1.212
B) 0.816
C) 1.000
D) 1.056
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6.
Three randomly chosen Colorado students were asked how many times they went rock climbing last month. Their replies were 5, 6, 7. The coefficient of variation is
A) 16.6%
B) 13.6%
C) 20.0%
D) 35.7%
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7.
Heights of randomly chosen students in a certain class have a mean of 69.11 inches with a variance of 19.78 inches. Convert theses statistics to centimeters. (Note: 1 inch = 2.54 cm).
A) 175.54 and 50.24 respectively
B) 175.54 and 127.61 respectively
C) 27.21 and 7.79 respectively
D) Cannot be converted without knowing the distribution.
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8.
Craig operates a part time snow plowing business using a 2002 GMC 2500 HD extended cab short box truck.
This boxplot of MPG on 195 tanks of gas does not show that
A) there are outliers.
B) the distribution is strongly right skewed.
C) the data are mostly concentrated in a narrow range.
D) the interquartile range is a less than 2 MPG.
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9.
Estimate the mean exam score for the 50 students in Prof. Axolotl s class.
A) 59.2
B) 62.0
C) 63.5
D) 64.1
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10.
A survey of salary increases received during a recent year by 44 working MBA students is shown.
Find the approximate mean percent raise.
A) 6.56.
B) 6.74
C) 5.90
D) 6.39
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11.
A population has 75 observations. A class interval has a frequency of 15 observations. The relative frequency in this category is:
A) 0.20
B) 0.10
C) 0.15
D) 0.75
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12.
Below is a frequency distribution of earnings of 50 contractors in a country.
Earnings (thousands)

Number of Contractors

1 10

2

11 20

7

20 30

12

31 40

15

41 50

8

50 60

6

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Regarding this distribution, which of the following is correct?
A) The frequency distribution contains too many class intervals.
B) The class intervals are not mutually exclusive.
C) Too few classes were chosen.
D) The class intervals are too wide.
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13.
An astute statistician found an error in the following frequency distribution. What is it?

A) The classes are not mutually exclusive
B) The classes are not collectively exhaustive.
C) There are too few class intervals.
D) The first class should start at 0.
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14.
The following is the distribution of the weekly pay of a certain group of employees:
The group s mean pay is
A) $112.50
B) $125.01
C) $105.47
D) $117.13
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15.
The following table is the frequency distribution of parking fees for a day:
The mean parking fee is
A) $7.07
B) $6.95
C) $7.00
D) $7.25