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SJSU statistics solutions
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# SJSU statistics

1. A SJSU statistics instructor is interested in the median number of classes the state of California college students take. What is

the population she is interested in?

a) all SJSU College students

b) all college students in the state of California.

c) all SJSU students in her classes

d) all SJSU math students

2. The instructor later finds out the population median is 4 classes. This is an example of:

a) Parameter

b) Data

c)

Statistic

d) Variable

3. A study was done to determine the age, number of times per month local public transportation was used in Detroit. Ten city

blocks were randomly selected and all were interviewed in each block. The sampling method was:

a) simple random

b) Systematic

c) Stratified

d) Cluster

4.

Pulse rate measurements (beats per minute) were taken from 40 females (Table 1). What is the relative frequency for females with a

pulse rate of 80 to 89?

a) 20.3%

b)

27.5%

c) 30%

d) 30.2%

5.

Which quarter has the smallest spread of data?

a) Q1

b) Q2

c) Q3

d) Q4

6. You are investigating if a new diet pill really works. You will be doing a random sample of 50 patients who took the pill for

six months. Which one is the variable?

a) The number of pounds lost or gained by one patient.

b) The mean pounds lost or gained.

c) The median pounds lost or gained.

d) The pounds lost by the patients.

7. Match the different types of data.

Question 7 options:

Hair Color

Qualitative

Number of oranges per tree

Quantitative continuous

Weight of newborn babies

Quantitative discrete

8. Which chart (based on data type) would be the best to represent income of school teachers?

a) Histogram

b) Bar

c) Pareto

d) Pie

9. You take a random sample (n=2000) by calling people on their landlines at noon. You later find your sample mean is way off

the population mean. Most likely you have what type of error?

a) nonsampling error

b) random error

c) sampling bias

d) variation error

10. Match the level of measurement with its best example.

The best colleges in the U.S. from top to bottom.

Favorite make of car

Melting point of different substances.

1. Nominal scale level

2. Ordinal scale level

IQ Scores

3. Interval scale level

4. Ratio Scale

11. For the following pulse rate measurements for females what is the mean?

Pulse rates:

76

Question 11 options:

a) 62.3

b) 69.3

72

88

60

72

68

68

80

76

68

c) 71.8

d) 72.8

12. What is the mode value (as opposed to mean or median) for the following test scores?

Stem

3

4

5

6

7

8

9

10

Leaf

3

299

355

1388999

2348

03889

0244446

0

a) 69

b) 88

c) 89

d) None of the above

13. Find the mean for the following group data:

Audit time (days)

10-14

15-19

20-24

25-29

30-34

a) 16 days

b) 18 days

c)

20 days

Frequency

4

8

5

2

1

d)

22 days

14. For the following pulse rate measurements for females what is the standard deviation?

Pulse rates:

76

a) 7.7

b)

8.7

72

88

60

72

68

68

80

76

68

c) 9.7

d) 9.9

15. Find the standard deviation for the following group data:

Audit time (days)

10-14

15-19

20-24

25-29

30-34

a) 4.5 days

b) 5.5 days

c) 6 days

Frequency

4

8

5

2

1

d) 6.5 days

16. You work at the HR department in an IT firm in silicon value and you need to recruit new programmers. There is a standard

math test with a mean of 80 and a standard deviation of 5. You need a score of at least 75 so out of 100 applicants about how

many on average should be qualified? Assume a bell shaped curve and symmetric distribution of scores.

a) 34 out of 100 applicants.

b) 68 out of 100 applicants.

c) 75 out of 100 applicants.

d) 84 out of 100 applicants.

17. Below are the starting salaries for business school graduates. What is the IQR value?

1

2

3

4

5

6

Monthly Salary

2850

2950

3050

2880

2755

2710

a) 115

b) 125

c) 135

7

2890

8

3130

9

2940

10

3325

11

2920

12

2880

d) 145

18. Below are the starting salaries for business school graduates. What is the median?

1

2

3

4

5

6

Monthly Salary

2850

2950

3050

2880

2755

2710

a) 2905

7

2890

8

3130

9

2940

10

3325

11

2920

12

2880

b) 2935

c) 2955

d) None of the above

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SJSU statistics Pin It 1. A SJSU statistics instructor is interested in the median number of classes the state of California college students take. What is the population she is interested in? a) all SJSU College stude

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