In a survey, 800 adults in a certain country were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for mean number of hours worked was lower bound: 39.4 and upper bound 45.5. Which of the following represents a reasonable interpretation of the result? For those that are not reasonable, explain the flaw. Complete parts (a) through (d) below. (a) There is a 95% chance the mean number of hours worked by adults in this country in the previous week was between 39.4 hours and 45.5 hours. OA. Flawed. This interpretation implies that the mean is only for last week. OB. Flawed. This interpretation implies that the population mean varies rather than the interval. OC. Flawed. This interpretation makes an implication about individuals rather than the mean. OD. Correct. This interpretation is reasonable. (b) We are 95% confident that the mean number of hours worked by adults in this country in the previous week was between 39.4 hours and 45.5 hours. OA. Flawed. This interpretation implies that the population mean varies rather than the interval. OB. Correct. This interpretation is reasonable. OC. Flawed. This interpretation makes an implication about individuals rather than the mean. OD. Flawed. This interpretation does not make it clear that the 95% is the probability that the mean is within the interval. (c) 95% of adults in this country worked between 39.4 hours and 45.5 hours last week OA. Correct. This interpretation is reasonable. OB. Flawed This interpretation makes an implication about individuals rather than the mean. OC. Flawed This interpretation implies that the mean is only for last week. OD. Flawed. This interpretation does not make it clear that the 95% is the probability that the mean is within the interval.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.