A random sample of 42 textbooks has a mean price of $114

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Presentation transcript:

A random sample of 42 textbooks has a mean price of $114 A random sample of 42 textbooks has a mean price of $114.50 and a standard deviation of $12.30. Find a point estimate for the mean price of all textbooks. $42 $12.30 $114.50 $2.73

A random sample of 42 textbooks has a mean price of $114 A random sample of 42 textbooks has a mean price of $114.50 and a standard deviation of $12.30. Find a point estimate for the mean price of all textbooks. $42 $12.30 $114.50 $2.73

Find the critical value zc necessary to form a 98% confidence interval. 2.33 2.05 0.5040 0.8365

Find the critical value zc necessary to form a 98% confidence interval. 2.33 2.05 0.5040 0.8365

A random sample of 42 textbooks has a mean price of $114 A random sample of 42 textbooks has a mean price of $114.50 and a standard deviation of $12.30. Find a 98% confidence interval for the mean price of all textbooks. (111.38, 117.62) (110.08, 118.92) (110.78, 118.22) (109.61, 119.39)

A random sample of 42 textbooks has a mean price of $114 A random sample of 42 textbooks has a mean price of $114.50 and a standard deviation of $12.30. Find a 98% confidence interval for the mean price of all textbooks. (111.38, 117.62) (110.08, 118.92) (110.78, 118.22) (109.61, 119.39)

Determine the minimum sample size needed to construct a 95% confidence interval for the mean age of employees at a company. The estimate must be accurate to within 0.5 year. Assume the standard deviation is 4.8 years. 18 19 354 355

Determine the minimum sample size needed to construct a 95% confidence interval for the mean age of employees at a company. The estimate must be accurate to within 0.5 year. Assume the standard deviation is 4.8 years. 18 19 354 355

Find the critical value tc necessary to form a 95% confidence interval with a sample size of 15. 1.960 2.145 2.131 2.120

Find the critical value tc necessary to form a 95% confidence interval with a sample size of 15. 1.960 2.145 2.131 2.120

A random sample of 15 DVD players has a mean price of $64 A random sample of 15 DVD players has a mean price of $64.30 and a standard deviation of $5.60. Find a 95% confidence interval for the mean price of all DVD players. (61.20, 67.40) (61.47, 67.13) (61.22, 67.38) (61.10, 67.51)

A random sample of 15 DVD players has a mean price of $64 A random sample of 15 DVD players has a mean price of $64.30 and a standard deviation of $5.60. Find a 95% confidence interval for the mean price of all DVD players. (61.20, 67.40) (61.47, 67.13) (61.22, 67.38) (61.10, 67.51)