Which of the following is inappropriate in citing the statistics?
A: Joan's family has 5 children, 11 cats, 3 turtles, 15 gerbils, and 2 canaries.
B: About half of the middle school students own a smart phone.
C: Our research indicates that only 33% of people like purple cars.
D: The class did well on its first exam, with a mean score of 89.5% and a standard deviation of 7.8%.
A: Joan's family has 5 children, 11 cats, 3 turtles, 15 gerbils, and 2 canaries.
B: About half of the middle school students own a smart phone.
C: Our research indicates that only 33% of people like purple cars.
D: The class did well on its first exam, with a mean score of 89.5% and a standard deviation of 7.8%.
举一反三
- Which of the following about the normal distribution is NOT true? A: Theoretically, the mean, median, and mode are the same B: About 68% of the observations fall within ±1 standard deviation from the mean C: Its parameters are the mean, μ, and standard deviation, σ D: It is a discrete probability distribution.
- 2.Which of the following about the normal distribution is NOT true A: Theoretically, the mean, median, and mode are the same. B: About 2/3 of the observations fall within ±1 standard deviation from the mean. C: It is a discrete probability distribution. D: Its parameters are the mean, μ, and standard deviation, σ.
- When measuring the dispersion of the sample mean, the statistics to be used are ( ) . A: Coefficient of variation B: The standard deviation C: Standard deviation of the mean D: Range value
- Which of the following statement about the normal distribution is FALSE() A: It is completely described by its mean and standard deviation. B: It has a skewness of 1. C: It is bell-shaped.
- Which of the following methods of market research is not an example of "primary research"? ( ) A: Questionnaires B: A company’s own sales statistics and records C: Test marketing D: Consumer panels