It is important that the sample be representative of the population.
Indicate whether the statement is true or false
Q. 2Moods A headline in the New York Times announced Research shows running can alter one's moods.
The article reported that researchers gave a Personality Assessment Test to 231 males who run at least 20 miles a week, and found statistically significant personality differences between the runners and the male population as a whole. Do you think the headline was appropriate? Explain.
Q. 3A simple random sample from a finite population is a sample which is chosen in such a way that each possible
sample has the same probability of being selected.
Indicate whether the statement is true or false
Q. 4The mean of a list of numbers is more likely to be affected by extreme values than the median.
Indicate whether the statement is true or false
Q. 5The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 1700 miles.
What warranty should the company use if they want 96 of the tires to outlast the warranty?
A) 58,300 mi B) 57,025 mi C) 62,975 mi D) 61,700 mi
Q. 6The interquartile range is a better measure of variation than:
A) the range. B) the mean deviation.
C) the standard deviation. D) the variance.
Q. 7For ordinal data, we can _______ , but for nominal data we cannot.
Fill in the blank(s) with correct word
Q. 8A die is rolled 10 times. The probability of obtaining from 4 to 7 threes should be determined using the formula
for the
A) hypergeometric distribution. B) Poisson distribution.
C) binomial distribution. D) multinomial distribution.
Quick Reply
