A researcher wants to determine the sample size necessary to adequately conduct a study to estimate the population mean to within 5 points. The range of population values is 80 and the researcher plans to use a 90% level of confidence. The sample size should be at least _______.

692

62

44

216

700

The number of finance majors within the School of Business is an example of _______.

a constant

a continuous random variable

the normal distribution

a discrete random variable

the Poisson distribution

Suppose a population has a mean of 400 and a standard deviation of 24. If a random sample of size 144 is drawn from the population, the probability of drawing a sample with a mean less than 402 is _______.

0.6826

0.9875

0.3413

0.1587

0.8413

The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 75 hours. Tests show that the life of the bulb is approximately normally distributed. It can be concluded that approximately 68% of the bulbs will last between _______.

975 and 1475 hours

1125 and 1275 hours

900 and 1100 hours

950 and 1050 hours

1050 and 1350 hours