1) What was the mean quantity ordered?
A. 48.0
B. 52.7
C. 10
D. 74.5
2) What percentage of orders is for quantity between 50-59 units?
A. 92%
B. 74%
C. 36%
D. 26%
3) For each of the past 30 days, a researcher has recorded the number of individuals in a city who signed up for insurance under the Healthcare Reform Act. Which of the following graphical summaries is most appropriate to display the data she has collected?
A. Histogram
B. Pie chart
C. Bar chart
D. Line graph
E. Stem and leaf diagram
Use the following data for Questions 4-6.
XYZ Corporation has advertised an open position. The number of applications received during 5 randomly selected days is listed below.
4) What is the mean number of applications received in this sample?
A. 29.0
B. 25.0
C. 28.0
D. 22.0
5) What is the median number of applications received in this sample?
A. 29.0
B. 25.0
C. 28.0
D. 22.0
6) What is the standard deviation for this sample of applicants?
A. 72
B. 7.6
C. 57.6
D. 8.5
7) The time that a telemarketer spends on the phone in an attempt to make a sale is normally distributed with a mean of 8 minutes and a standard deviation of 1.2 minutes. What is the probability that the call takes longer than 10 minutes?
A. 0.05
B. 0.13
C. 0.22
D. 0.01
8) The manager of the telemarketing call center (discussed in problem 7) is concerned about calls that are too short (agent is not pushy enough) or too long (agent is inefficient). He wants to identify the middle 97% of call times, and issue warnings to an agent when the call time falls outside of that range. Compute the lower and upper limit for the middle 97% of calls.
A. Approximately 5.7 to 10.3 minutes
B. Approximately 4.8 to 9.7 minutes
C. Approximately 5.4 to 10.6 minutes
D. Cannot be estimated with the available data
9) The telemarketing company has determined that 20% of the calls their agents make result in a successful sale. Assume 15 calls are made one morning. What is the probability that 3 or fewer of the calls are successful (i.e., make a sale). Assume binomial distribution.
A. 0.25
B. 0.65
C. 0.40
D. 0.61
E. 0.36
10) Contact information about potential customers arrives at the telemarketing company at an average rate of 8 every 15 minutes. What is the probability that in the next 15 minutes information about 10 or fewer potential customers arrives? Assume Poisson arrivals.
A. 0.816
B. 0.772
C. 0.395
D. 0.886
Download:- Statistics.pdf