Chapter 11: Q.54 (page 730)
The expected count of females who respond 鈥渁lmost certain鈥 is
(a) .
(b) .
(c) .
(d) .
(e) None of these.
Short Answer
The expected count is . Therefore, the correct option (c).
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Chapter 11: Q.54 (page 730)
The expected count of females who respond 鈥渁lmost certain鈥 is
(a) .
(b) .
(c) .
(d) .
(e) None of these.
The expected count is . Therefore, the correct option (c).
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Refer to Exercise 37. Do the data provide convincing evidence of a difference in the effectiveness of the four treatments? Carry out an appropriate test at the significance level

Mars, Inc., reports that their M&M鈥橲 Peanut Chocolate Candies are produced according to the following color distribution: 23% each of blue and orange, 15% each of green and yellow, and 12% each of red and brown. Joey bought a bag of Peanut Chocolate Candies and counted the colors of the candies in his sample: 12 blue, 7 orange, 13 green, 4 yellow, 8 red, and 2 brown
State appropriate hypotheses for testing the company鈥檚 claim about the color distribution of peanut M&M鈥橲
Average ratings The students decided to compare the average ratings of the cafeteria food on the two scales.
(a) Find the mean and standard deviation of the ratings for the students who were given the -to-scale.
(b) For the students who were given the -to-scale, the ratings have a mean of and a standard deviation of . Since the scales differ by one point, the group decided to add to each of these ratings. What are the mean and standard deviation of the adjusted ratings?
(c) Would it be appropriate to compare the means from parts (a) and (b) using a two-sample t-test? Justify your answer
Refer to Exercises 1 and 3.
(a) Confirm that the expected counts are large enough to use a chi-square distribution. Which distribution (specify the degrees of freedom) should you use?
(b) Sketch a graph like Figure 11.4 (page 683) that shows the P-value.
(c) Use Table C to find the P-value. Then use your calculator鈥檚 C2cdf command
(d) What conclusion would you draw about the company鈥檚 claimed distribution for its deluxe mixed nuts? Justify your answer.
Do the data provide convincing evidence of a difference in the effectiveness of the four treatments? Carry out an appropriate test at the significance level.

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