A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 137 students who averaged 28.8 texts per day. The standard deviation was 17.9 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a (t/z) distribution. b. With 98% confidence the population mean number of texts per day is between __and___ texts. c. If many groups of 137 randomly selected members are studied, then a different confidence interval would be produced from each group. About___ percent of these confidence intervals will contain the true population number of texts per day and about ___ percent will not contain the true population mean number of texts per day.
A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 137 students who averaged 28.8 texts per day. The standard deviation was 17.9 texts. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a (t/z) distribution.
b. With 98% confidence the population mean number of texts per day is between __and___ texts.
c. If many groups of 137 randomly selected members are studied, then a different confidence interval would be produced from each group. About___ percent of these confidence intervals will contain the true population number of texts per day and about ___ percent will not contain the true population mean number of texts per day.
It is defined as the range which contains the value of true population parameter. The confidence interval is constructed for various population parameters like population mean, population standard deviation and so on.
The confidence interval can be interpreted as : With a stated level of confidence, it can be said that the true population parameter for which confidence interval is constructed lies with the obtained confidence interval.
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