Q1. With ______ random sampling, there is homogeneity within a subgroup or stratum.
A. judgmental
B. simple
C. cluster
D. stratified
Q2. Penny Bauer, Chief Financial Officer for Harrison Haulage, suspects irregularities in the payroll system. If 10% of the 5000 payroll vouchers issued since 1 January 2005, have irregularities, the probability that Penny's random sample of 200 vouchers will have a sample proportion .06 and .14 is ___________.
A. 0.4706
B. 0.9706
C. 0.0588
D. 0.9412
Q3. Catherine Cho, Director of Marketing Research, needs a sample of Darwin households to participate in the testing of a new toothpaste. If 40% of the households in Darwin prefer the new toothpaste, the probability that Catherine's random sample of 300 households will have a sample proportion between 0.35 and 0.45 is ___________.
A. 0.9232
B. 0.0768
C. 0.4616
D. 0.0384
Q4. James Weepu, Human Resources Manager with Auckland First Bank (AFB), is reviewing the employee training programs of AFB branches. His staff randomly selected personnel files for 100 tellers in the Southern Region and determined that their mean training time was 25 hours. Assume that the population standard deviation is 5 hours. The 95% confidence interval for the population mean of training times is ________.
A. 15.20 to 34.80
B. 24.18 to 25.82
C. 24.02 to 25.98
D. 16.78 to 33.23
Q5. A random sample of 64 items is selected from a population of 400 items. The sample mean is 200. The population standard deviation is 48. From this data, a 90% confidence interval to estimate the population mean can be calculated as _______.
A. 189.21 to 210.79
B. 188.24 to 211.76
C. 190.13 to 209.87
D. 190.94 to 209.06