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1. Which firm do you prefer according to the table above? Why? 2. Construct and interpret a 99% confidence interval for the difference of two population means. 3. Does tbe data indicate that the effectiveness of firm A's circuit board is different from firm B? Test at 1% level ofsignificance. 4. Isyour result in confidence interval consistent with your result in hypothesis testing? Stale the reason.

1. Which firm do you prefer according to the table above? Why? 2. Construct and interpret a 99% confidence interval for the difference of two population means. 3. Does tbe data indicate that the effectiveness of firm A's circuit board is different from firm B? Test at 1% level ofsignificance. 4. Isyour result in confidence interval consistent with your result in hypothesis testing? Stale the reason.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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The mean lifetime of colour television circuit boards (in months) produced by Firms A and B are to be compared. The sample of 20 circuit boards is randomly assigned to each firm. Both. populations have a normal distribution. The summary statistics are presented in the table below. Sample Mean Lifetime Circuit Hoard (month ) Population Standard Dcviallon (months) Firm A 4.5 0.38 B 2.9 0.48 1. Which firm do you prefer according to the table above? Why? 2. Construct and interpret a 99% confidence interval for the difference of two population means. 3. Does tbe data indicate that the effectiveness offirm A's circuit board is different from firm B? Test at 1% level of significance. 4. Isyour result in confidence interval consistent with your result in hypothesis testing? Stale the reason.
Transcribed Image Text:The mean lifetime of colour television circuit boards (in months) produced by Firms A and B are to be compared. The sample of 20 circuit boards is randomly assigned to each firm. Both. populations have a normal distribution. The summary statistics are presented in the table below. Sample Mean Lifetime Circuit Hoard (month ) Population Standard Dcviallon (months) Firm A 4.5 0.38 B 2.9 0.48 1. Which firm do you prefer according to the table above? Why? 2. Construct and interpret a 99% confidence interval for the difference of two population means. 3. Does tbe data indicate that the effectiveness offirm A's circuit board is different from firm B? Test at 1% level of significance. 4. Isyour result in confidence interval consistent with your result in hypothesis testing? Stale the reason.
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