Quiz
Chapter 6
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Questions in this quiz (12)
1A survey of the students in a psychology class revealed that there were 19 females and 8 males. Of the 19 females, only 4 had no brothers or sisters, and 3 of the males were also the only child in the household. If a student is randomly selected from this class, then what is the probability of selecting a female who has no siblings?
- A4/19
- B4/27
- C19/27
- D7/27
2A colony of laboratory rats contains 18 white rats and 7 spotted rats. What is the probability of randomly selecting a white rat from this colony?
- A1/18
- B1/25
- C17/25
- D18/25
3A jar contains 20 red marbles and 10 blue marbles. If you take a random sample of n = 3 marbles from this jar, and the first two marbles are both red, what is the probability that the third marble also will be red?
- A20/30
- B18/28
- C1/30
- D1/28
4What proportion of a normal distribution is located in the tail beyond a z-score of z = –1.50?
- A-0.0668
- B-0.9332
- C0.0668
- D0.9332
5A vertical line is drawn through a normal distribution at z = –1.00. How much of the distribution is located between the line and the mean?
- A15.87%
- B34.13%
- C84.13%
- D-15.87%
6What z-score separates the lowest 10% of the distribution from the rest?
- Az = 0.90
- Bz = -0.90
- Cz = 1.28
- Dz = -1.28
7For a normal distribution with a mean of μ = 500 and σ = 100, what is the probability of selecting an individual with a score less than 400?
- A0.1587
- B0.8413
- C0.3413
- D-0.1587
8For a normal distribution with a mean of μ = 40 and σ = 4, what is the probability of selecting an individual with a score greater than 46?
- A0.0668
- B0.4452
- C0.9332
- D0.0548
9SAT scores for a normal distribution with mean of μ = 500 with σ = 100. What SAT score separates the top 10% of the distribution from the rest?
- A128
- B628
- C501.28
- D372
10For a normal distribution with μ = 100 and σ = 10, which of the following accurately describes the location of X = 80?
- AIt is an extreme, very unlikely score.
- BIt is a low score, but not extreme or unlikely.
- CIt is a fairly representative score.
- DNone of the other options is an accurate description.
11For a normal distribution with μ = 100 and σ = 10, what X values separate the middle 95% from the extreme values in the tails of the distribution?
- AX = 83.5 and X = 116.5
- BX = 80.4 and X = 119.6
- CX = 87.2 and X = 112.8
- DX = 95 and X = 105
12An individual is selected from a normal population with μ = 100 and σ = 10 and a treatment is administered to the individual. After treatment, the individual has a score of X = 125. What is the probability that individual with a score this high or higher would be obtained if the treatment has no effect?
- A0.0668
- B0.0228
- C0.0062
- D0.9938
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- Year 1 Statistics I Quiz on Chapter 6, created by Eloise Brisson on 25/08/2022.
- Author
- Eloise Brisson
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- English
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