A survey of 25 randomly selected customers found that their average age was 31.84 years with a standard deviation of 9.84 years.
A survey of 25 randomly selected customers found that their average age was 31.84 years with...
years. A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.84 years and the standard deviation is 8.84 25 39 43 25 42p a) Construct a 99% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence 23 28 42 45 31 interval have been met. b) How large is the margin of error? c) How would the confidence interval change if you had assumed...
A survey of 25 randomly selected customers found the ages shown? (in years). The mean is 33.16 years and the standard deviation is 9.21 years. 47 35 45 21 30 42 49 29 28 35 27 29 45 35 11 34 28 33 44 39 34 25 34 32 18 a) What is the 90% confidence interval for the mean age of all customers assuming that the assumptions and conditions for the confidence interval have been met? b) What is...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is 33.60 years and the standard deviation is 9.52 years a) Construct a 90% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met. b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the standard deviation was known to be 10.0 years?...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.00 years and the standard deviation is 9.99 3 years. a Construct a 99% confidence interval for the mean age of all customers, assuming that the assumptions and conditions or the con interval have been met b) How large is the margin of error? c) How would the confidence interval change i you had assumed that the standard deviation was known to be 10.0...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.28 years and the standard deviation is 9.35 31 21 44 32 34 11 48 42 23 45 39 35 31 28 29 43 34 37 20 44 33 27 24 a) Construct a 80% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met. b) How large is the margin of...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.32 years and the standard deviation is 8.72 25 37 27 32 46 32 17 27 30 36 42 33 30 41 13 27 44 26 35 32 28 30 49 25 44 years a) How many degrees of freedom does the t-statistic have? b) How many degrees of freedom would the t-statistic have if the sample size had been 400? a) The t-statistic...
A survey of 25 randomly selected customers found the ages shown (in years) The mean is 32.68 years and the standard deviation is 9 47 years a) How many degrees of freedom does the t-statistic have? b) How many degrees of freedom would the t-statistic have if the sample size had been 400? 25 25 22 38 420 25 26 37 34 39 46 37 24 13 45 20 42 17 48 34 32 35 39 40 32 a) The...
33 46 48 21 30 32 10 31 20 29 A survey of 25 randomly selected customers found the ages shown (in years). The mean is 31.76 years and the standard deviation is 10.37 years. a) Construct a 98 % confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence 20 38 40 35 40 interval have been met. 22 37 10 41 26 b) How large is the margin of error?...
c) Also, would the confidence interval become more narrow, or more wider? A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.92 years and the standard deviation is 9.73 years a) Construct a 99% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met. b) How large is the margin of error? c) How would the confidence interval change if you...
Question Help O A survey of 25 randomly selected customers found the ages shown in years). The meanis 33 08 years and the standard deviation is 9.53 years a) What is the standard error of the mean? b) How would the standard error change if the sample size had been 400 instead of 257 (Assume that the sample standard deviation didn't change) 24 47 36 29 450 39 45 29 25 23 26 41 36 36 35 41 36 22...