If the interquartile range for a set of data is 10 minutes, this means that the data have a spread of only 10 minutes.
Indicate whether the statement is true or false
Q. 2There are 15 professors in the School of Education. Twelve of them have received good evaluations from students, while 3 received poor evaluations. You will take three courses in the School of Education next semester.
What is the probability that all of your professors next semester have received good evaluations?A) 0.516
B) 0.484
C) 0.258
D) 0.242
Q. 3The larger the number of observations in a numerical data set, the smaller the number of class intervals needed for constructing a grouped frequency distribution.
Indicate whether the statement is true or false
Q. 4The manager of the local health club is interested in determining the number of times members use the weight room per month.
She takes a random sample of 15 members and finds that over the course of a month, the average number of visits was 11.2 with a standard deviation of 3.2. Assuming that the monthly number of visits is normally distributed, which of the following represents a 95 confidence interval for the average monthly usage of all health club members?
A) 11.2 1.74
B) 11.2 1.77
C) 11.2 1.62
D) 11.2 1.83
Q. 5What is P(0.33 < Z < 0.45 )?
A) 0.5443
B) 0.0443
C) 0.4557
D) 0.1515
Q. 6A recent survey showed that 5 percent of the computer keyboards produced by a particular company are defective. What is the probability that out of eight keyboards selected at random, exactly zero keyboards will be defective?
A) 0.0054
B) 0.2793
C) 0.6634
D) 0.6983