STATISTICS QUESTIONS AND ANSWERS (MIDTERM
MULTIPLE CHOICE). 2024 A+ GRADE REVISION
MATERIAL
1. Z is a standard normal random variable. The P (-1.96<z<-1.4) equals:
A. .8942
B. .4192
c. .475
D. .0558: D. .0558
2. A production process produces 2% defective parts. A sample of five
parts from the production process is selected. What is the probability that
the sample contains exactly two defective parts?
A. .0004
B. .0038
c. .02
D. .10: B. .0038
3. A can be used to graphically present quantitative data:
A. histogram
B. both a histogram and a stem and leaf display are correct
C. pie chart
D. stem and leaf display: B. both a histogram and a stem and leaf display are
correct
4. San Fran 49er linebacker Patrick Willis won the Defensive Rookie of the
year award of in 2007 with a total of 174 tackles. Tackles are measured on
what kind of scale? Is a variable measuring the number of tackles
considered continuous or discrete?
A. interval scale: continuous
B. ratio scale, continuous
C. interval scale, discrete
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, STATISTICS QUESTIONS AND ANSWERS (MIDTERM
MULTIPLE CHOICE). 2024 A+ GRADE REVISION
MATERIAL
D. ratio scale, discrete: D. ratio scale, discrete
5. As of Sept 30, 2017 the earnings per share of five firms in the biotech
industry are
1.53
2.29
2.17
1.69
.07
The sample mean and the sample standard deviation are the closest to:
A. 1.53 and .76
B. 1.55 and .76
C. 1.55 and .89
D. 1.53 and .87: C. 1.55 and .89
6. Suppose taxi fares from Logan Airport to downtown Boston is known to
be normally distributed with a standard deviation of 2.50. The last seven
times John has taken a taxi from Logan to downtown Boston, the fares have
been 22.10, 23.25, 21.35, 24.50, 21.90, 20.75, 22.65. Construct a 95%
confidence interval for the population mean taxi fare?
A. (20.505, 24.209)
B. (17.457, 27.257)
c. (20.802, 23.911)
D. (21.657, 23.057): A. (20.505, 24.209)
7. Excel NORM.S. DIST function can be used to compute: A.
the standard normal z value given a cumulative probability
2/11
MULTIPLE CHOICE). 2024 A+ GRADE REVISION
MATERIAL
1. Z is a standard normal random variable. The P (-1.96<z<-1.4) equals:
A. .8942
B. .4192
c. .475
D. .0558: D. .0558
2. A production process produces 2% defective parts. A sample of five
parts from the production process is selected. What is the probability that
the sample contains exactly two defective parts?
A. .0004
B. .0038
c. .02
D. .10: B. .0038
3. A can be used to graphically present quantitative data:
A. histogram
B. both a histogram and a stem and leaf display are correct
C. pie chart
D. stem and leaf display: B. both a histogram and a stem and leaf display are
correct
4. San Fran 49er linebacker Patrick Willis won the Defensive Rookie of the
year award of in 2007 with a total of 174 tackles. Tackles are measured on
what kind of scale? Is a variable measuring the number of tackles
considered continuous or discrete?
A. interval scale: continuous
B. ratio scale, continuous
C. interval scale, discrete
1/11
, STATISTICS QUESTIONS AND ANSWERS (MIDTERM
MULTIPLE CHOICE). 2024 A+ GRADE REVISION
MATERIAL
D. ratio scale, discrete: D. ratio scale, discrete
5. As of Sept 30, 2017 the earnings per share of five firms in the biotech
industry are
1.53
2.29
2.17
1.69
.07
The sample mean and the sample standard deviation are the closest to:
A. 1.53 and .76
B. 1.55 and .76
C. 1.55 and .89
D. 1.53 and .87: C. 1.55 and .89
6. Suppose taxi fares from Logan Airport to downtown Boston is known to
be normally distributed with a standard deviation of 2.50. The last seven
times John has taken a taxi from Logan to downtown Boston, the fares have
been 22.10, 23.25, 21.35, 24.50, 21.90, 20.75, 22.65. Construct a 95%
confidence interval for the population mean taxi fare?
A. (20.505, 24.209)
B. (17.457, 27.257)
c. (20.802, 23.911)
D. (21.657, 23.057): A. (20.505, 24.209)
7. Excel NORM.S. DIST function can be used to compute: A.
the standard normal z value given a cumulative probability
2/11
