Smith Motors currently has 50 cars in their inventory. The following table shows the number of cars in each class of combined city and highway miles per gallon.
Miles per Gallon Number of Cars
10 to under 15 9
15 to under 20 23
20 to under 25 15
25 to under 30 seconds 3
What is the approximate average miles per gallon for cars from this population?
A) 16.5
B) 17.0
C) 18.7
D) 19.3
Q. 2The null hypothesis for ANOVA assumes that not all of the population means being compared are equal.
Indicate whether the statement is true or false
Q. 3A golfer claims that his average golf score at the course he plays regularly is less than 90. A Type II error would occur if the golfer concludes that the average score is _____________________________
_______.
A) 90 or more when, in reality, the average score is less than 90
B) more than 90 when, in reality, the average score is equal to 90
C) less than 90 when, in reality, the average score is 90 or more
D) 90 or less when, in reality, the average score is equal to 90
Q. 4According to the Bureau of Labor Statistics, 7.1 of the labor force was recently unemployed. A random sample of 100 employable adults was selected.
Using the normal approximation to the binomial distribution, what is the probability that fewer than 11 people from this sample are unemployed?A) 0.5574
B) 0.6539
C) 0.8217
D) 0.9066
Q. 5A computer system for an organization generates four-letter temporary passwords. The total number of passwords that the system can generate is ________.
A) 14,950
B) 358,800
C) 456,976
D) none of the above
Q. 6Assume that the number of pieces of junk mail per day that a person receives in their mail box follows the Poisson distribution and averages 4.3 pieces per day.
What is the probability that this person will receive one or two pieces of junk mail tomorrow?A) 0.1065
B) 0.1227
C) 0.1838
D) 0.2369
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