Q1) Random sample of ten employees is chosen from large firm. For 10 employees, the number of days each was absent during past month was found to be 0, 2, 4, 2, 5, 1, 7, 3, 2, and 4. Of the following values, which would you use as point estimate for average number of days absent for all firm's employees?

a) 2.5 

b) 3 

c) 4

d) 30

Q2) According to 1997 study, 29.3% of self-employed persons worked on their home based businesses 35 hours or more each week. Determine the probability that at least 30.5% of 800 people arbitrarily sampled from study's population worked on their businesses no less than 35 hours each week in 1997?

a) 0.2266 

b) 0.2734

c) 0.3050

d) 0.7500

Q3) In simple random sample from population that is approximately normally distributed, following data values were collected.

68, 79, 70, 98, 74, 79, 50, 102, 92, 96

Based on this information, confidence level would be 90% that population mean is somewhere between

a) 71.36 and 90.24        

b) 69.15 and 92.45

c) 65.33 and 95.33                 

d) 73.36 and 88.24