Two airlines are being compared with respect to the time it takes them to turn a plane around from the time it lands until it takes off again.
The study is interested in determining whether there is a difference in the variability between the two airlines. They wish to conduct the hypothesis test using an alpha = 0.02. If random samples of 20 flights are selected from each airline, what is the appropriate F critical value?A) 3.027
B) 2.938
C) 2.168
D) 2.124
Q. 2In forming the classes for a frequency distribution and histogram, suppose there were a number of empty classes. You should:
A) increase the class width.
B) decrease the class width.
C) keep the current class width.
D) use an ogive instead.
Q. 3In discussing a confidence interval estimate for a population mean, is it acceptable to provide an interpretation like the following: There is a 95 percent chance that lies in the range 20 to 40?
What will be an ideal response?
Q. 4Regardless of the value of the population proportion, p, (with the obvious exceptions of p = 0 and p = 1 ) the sampling distribution for the sample proportion, will be approximately normally distributed providing that the sample size is large
enough. Indicate whether the statement is true or false
Q. 5Hubble Construction Company has submitted a bid on a state government project that is to be funded by the federal government's stimulus money in Arizona. The price of the bid was predetermined in the bid specifications.
The contract is to be awarded on the basis of a blind drawing from those who have bid. Five other companies have also submitted bids.What is the probability of the Hubble Construction Company winning the bid?A) 0.2778
B) 0.1667
C) 0.6944
D) 0.0278
Q. 6In a recent audit report, an accounting firm stated that the mean sale per customer for the client was estimated to be between 14.50 and 28.50.
Further, this was based on a random sample of 100 customers and was computed using 95 percent confidence. Provide a correct interpretation of this confidence interval estimate.
Q. 7In performing a one-tailed test for the difference between two population variances, which of the following statements is true?
A) The level of alpha needs to be doubled before finding the F-critical value in the table.
B) The sample variance that is predicted to be larger in the alternative hypothesis goes in the numerator when forming the F-test statistic.
C) You always place the larger of the two sample variances in the numerator.
D) The alternative hypothesis must contain the equality.
Q. 8When using Excel's Histogram option under the Data Analysis tool, the term bins refers to:
A) the mid-point of each class.
B) the column where the data are located.
C) the upper limits of each class.
D) the lower limits of each class.
Quick Reply
