When considering area under the standard normal curve, decide whether the area to the left of z = 2.5 is bigger
than, smaller than, or equal to the area to the right of z = 2.5.
A) bigger than B) smaller than C) equal to
Q. 2The hypergeometric distribution with n = 150, a = 20, and b = 2180 can be approximated with a Poisson
distribution.
Indicate whether the statement is true or false
Q. 3In a boxplot, if the median is close to the left side of the box, the data is symmetric.
Indicate whether the statement is true or false
Q. 4In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean amount of money spent per owner was 109.33 per class.
Assuming the population standard deviation of the amount spent per owner is 12, construct and interpret a 95 confidence interval for the mean amount spent per owner for an obedience class.
A) (106.74, 111.92); we are 95 confident that the mean amount spent per dog owner for a single obedience class is between 106.74 and 111.92.
B) (106.23, 112.43); we are 95 confident that the mean amount spent per dog owner for a single obedience class is between 106.23 and 112.43.
C) (106.29, 112.37); we are 95 confident that the mean amount spent per dog owner for a single obedience class is between 106.29 and 112.37.
D) (106.78, 111.88); we are 95 confident that the mean amount spent per dog owner for a single obedience class is between 106.78 and 111.88.
Q. 5When a null hypothesis cannot be rejected, we conclude that
A) the null hypothesis is true. B) the null hypothesis may be true.
C) the alternative hypothesis is true. D) the alternative hypothesis may be true.
Q. 6A stem-and-leaf display is especially helpful when finding the mean of a set of data.
Indicate whether the statement is true or false
Q. 7A frequency distribution always has equal class intervals.
Indicate whether the statement is true or false
Q. 8According to the Federal Communications Commission, 70 of all U.S. households have vcrs. In a random sample of 15 households, what is the probability that fewer than 13 have vcrs?
A) 0.5 B) 0.7 C) 0.1268 D) 0.8732
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