# Develop an effect size measure (round to 2 decimal places) for

Develop an effect size measure (round to 2 decimal places) for Chapter 10 question 27 shown below:

A new weight-watching company, Weight Reducers International, advertises that those who join will

lose an average of 10 pounds after the first two weeks. The standard deviation is 2.8 pounds. A random

sample of 50 people who joined the weight reduction program revealed a mean loss of 9 pounds. At

the 0.05 level of significance, can we conclude that those joining Weight Reducers will lose less than 10

pounds?

Develop an effect size measure (round to 2 decimal places) for Chapter 15 question 47 shown below:

Vehicles heading west on Front Street may turn right, turn left, or go straight ahead at Elm Street. The

city traffic engineer believes that half of the vehicles will continue straight through the intersection. Of

the remaining half, equal proportions will turn right and left. Two hundred vehicles were observed, with

the following results. Can we conclude that the traffic engineer is correct? Use the 0.10 significance

level.

Straight Right Turn

The owner of Britten’s Egg Farm wants to estimate the mean number of eggs produced per chicken.

A sample of 20 chickens shows they produced an average of 20 eggs per month with a standard

deviation of 2 eggs per month. (Use t Distribution Table.)

d. Develop the 95% confidence interval for the population mean.

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