A. Deviations of the sample from the population that occur for reasons other than random sampling are referred to as ___________________? (sampling error, nonsampling error, standard deviations, velocity error)
B. Which of the following is a definition for critical value?
A) How many standard errors the sample mean is from the hypothesized value
B) How many standard errors we can go from the hypothesized value before we reject Ho
C) The probability of getting a test statistic equal to or more extreme than the one calculated
D) The value in the hypotheses.
C. A consulting company took a random sample of 2000 firms. Of those firms, 1200 had passed an OSHA inspection recently. If constructing a 90% confidence interval for the population proportion, the margin of error would be _____.
A) 2.82%
B) 1.8%
C) 1.11%
D) 2.15%
D. Suppose a 90% confidence interval for the population mean resulted in an upper limit of $658 and a lower limit of $273. What is the correct interpretation of this confidence interval?
A) There is a 0.90 probability the population mean is in this interval
B) We are 90% confident the population mean is in this interval
C) We are 90% confident the population proportion is in this interval
D) There is a 0.90 probability the sample mean is in this interval
E. The local vet is concerned about overweight Labrador Retrievers. She takes a random sample of 36 adult labs. Below is her analysis so far. She would like to do a 99% confidence interval for the true mean weight of Labradors.
Sample mean = 75.4 pounds
t score = 2.7238
Standard error = 3
Lower and Upper limits = _______ and _______
A) 67.2 and 83.6
B) 73 and 77
C) 70.3 and 80.5
D) 69.3 and 81.5