Which of the following statements is correct? for the populatian The sample mean

Question

Which of the following statements is correct? for the populatian The sample meanis a point O b The sample is a parameter. variance O The population mean is a point estimate for the sample O d The sample mean is a point estimate for the population standard Suppose a manufacturer produces cameras in batches of 200. A researcher is interested in the proportion of all cameras produced that are faulty so he randomly samples one batch and finds 5 faulty cameras. Which of the following would be a reasonable estimate of the population proportion of cameras that are not faulty? Which of the following must be true for a point estimator, a. to be an unbiased estimator Ob The median orthe amplingdiktribution of equals Suppose a manufacturer, Company B, produces lawnmowers and a researcher is interested in the proportion of all lawnmowers purchased that are made by this manufacturer. A random sample of 150 individuals who purchased lawnmowers was taken and it was found that 42 of them purchased lawnmowers produced by Company B. Which of the following is an unbiased estimate of the population proportion of lawnmowers purchased that are produced by Company B? all Ob The population proportion is not known so an unbiased estimate cannot be determined. If is a biased estimator for e, what is the amount of bias for this estimator if 35 and 0-3 The bias is equal to 0. Ob The biasis equal to 3. O The bias cannot be determined O The bias is equallo-3. If a random sample of size n-2s is taken from a continuous and symmetric distribution with a mean which of the following would be an unbiased estimator for o the median, r the mean. Ob O All of these choices. the trimmed mean R,

Explanation / Answer

Answers-

1) The sample mean is a point estimate for the population mean.

2) 0.975

3) E(Q^) = Q

4) 0.28

5) The bias is equal to 3

6) The mean x bar

7) Option c is correct.

8) The unbiased estimate with smallest variance

9) The mean x bar

10) The median

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