EC315 Confidence Interval Quiz Review 2

# EC315 Confidence Interval Quiz Review 2 - Quiz Review 1 An...

This preview shows pages 1–2. Sign up to view the full content.

Quiz Review 1. An experiment involves selecting a random sample of 256 middle managers at random for study. One item of interest is their mean annual income. The sample mean is computed to be \$35,420 and the sample standard deviation is \$2,050. What is the standard error of the mean? A: \$128.125 B: \$138.36 C: \$2,050 D: \$8.01 2. The wildlife department has been feeding a special food to rainbow trout fingerlings in a pond. A sample of the weights of 40 trout revealed that the mean weight is 402.7 grams and the standard deviation 8.8 grams. What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams? A: 0.3783 B: 0.0228 C: 1.0 D: 0.5 3. The mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weighing station and finds the mean is 15.8 tons, with a standard deviation of the sample of 4.2 tons. What is probability that a truck will

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

### Page1 / 4

EC315 Confidence Interval Quiz Review 2 - Quiz Review 1 An...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online