Statistics Questions explained in this solution

Sample Questions Exercise
Determine which of the four levels of measurement. 1 - 3.

1- Based on the Empirical Rule, what percent of the observations will lie above the mean plus two standard deviations?

a- 95%
b- 5%
c- 68%
d- 2.5%

2- If the sample variance for a frequency distribution consisting of hourly wages was computed to be 10, what is the sample standard deviation?

a- $1.96
b- $4.67
c- $3.16
d- $10.00

3- The closing prices of a common stock have been 61.50, 62, 61.25, 60.875 and 61.50
for the past week. What is the range?

a- $1.250
b- $1.750
c- $1.125
d- $1.875

Use the following information to answer questions 4 - 6.
A local newspaper recently conducted a survey of 400 households in the community to determine the number of daily newspapers that were being delivered to the residence. Results were used to obtain the following probability distribution:
x 0 1 2 3 4 or more
P(x) 0.15 0.35 0.35 0.10 0.05

4. What is the probability that a household receives at most 2 daily papers?
a. 0.15
b. 0.35
c. 0.50
d. 0.85

5. What is the probability that a household receives 3 or more daily papers?
a. 0.10
b. 0.15
c. 0.25
d. 0.35

6 What is the probability that a household receives at least 2 daily papers?
a. 0.15
b. 0.20
c. 0.35
d. 0.50

Use the following information to answer questions 7 - 11.
Use the data in the following table, which summarizes blood groups and Rh type for 100 typical people. These values may vary in different regions according to the ethnicity of the population.

Group
O A B AB
Type Rh+ 39 35 8 4
Rh- 6 5 2 1

7- If one person is randomly selected, find the probability of getting someone who is not group A.
a. 0.05
b. 0.40
c. 0.35
d. 0.60

8- If one person is randomly selected, find the probability of getting someone who is type Rh-.
a. 0.15
b. 0.14
c. 0.16
d. 0.17

9- If one person is randomly selected, find the probability of getting someone who is group A or type Rh-.
a. 0.49
b. 0.54
c. 0.35
d. 0.50

10- If one person is randomly selected, find the probability of getting someone who is group A or group B.
a. 0.40
b. 0.10
c. 0.05
d. 0.50

11- If one person is randomly selected, find the probability of getting someone who is group AB or type Rh+.
a. 0.05
b. 0.04
c. 0.87
d. 0.86

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