Question

A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 138 students who averaged 32.5 minutes concentrating on their professor during the hour lecture. The standard deviation was 10.8 minutes.

a. To compute the confidence interval use a distribution.

b. With 98% confidence the population mean minutes of concentration is between answer ____ and answer _____ minutes.

c. If many groups of 138 randomly selected members are studied, then a different confidence interval would be produced from each group. About answer ____ percent of these confidence intervals will contain the true population mean minutes of concentration and about answer ____ percent will not contain the true population mean minutes of concentration.

Answer #1

A researcher is interested in finding a 98% confidence interval
for the mean number minutes students are concentrating on their
professor during a one hour statistics lecture. The study included
147 students who averaged 34.2 minutes concentrating on their
professor during the hour lecture. The standard deviation was 10.6
minutes.
a. To compute the confidence interval use a ? t
z distribution.
b. With 98% confidence the population mean minutes of
concentration is between and minutes.
c. If many groups of 147...

A researcher is interested in finding a 98% confidence interval
for the mean number minutes students are concentrating on their
professor during a one hour statistics lecture. The study included
106 students who averaged 38.3 minutes concentrating on their
professor during the hour lecture. The standard deviation was 13.4
minutes. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a ? z
t distribution.
b. With 98% confidence the population mean minutes of
concentration is...

A researcher is interested in finding a 95% confidence interval
for the mean number minutes students are concentrating on their
professor during a one hour statistics lecture. The study included
136 students who averaged 33.6 minutes concentrating on their
professor during the hour lecture. The standard deviation was 11.5
minutes.
a. To compute the confidence interval use a ? t
z distribution.
b. With 95% confidence the population mean minutes of
concentration is between and minutes.
c. If many groups of 136...

A researcher is interested in finding a 90% confidence interval
for the mean number minutes students are concentrating on their
professor during a one hour statistics lecture. The study included
102 students who averaged 34.1 minutes concentrating on their
professor during the hour lecture. The standard deviation was 12.5
minutes. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a ? t
z distribution.
b. With 90% confidence the population mean minutes of
concentration is...

22
A researcher is interested in finding a 98% confidence interval
for the mean number minutes students are concentrating on their
professor during a one hour statistics lecture. The study included
101 students who averaged 35.2 minutes concentrating on their
professor during the hour lecture. The standard deviation was 12.1
minutes. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a
distribution.
b. With 98% confidence the population mean minutes of
concentration is between...

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 142 students who averaged 30.3 texts per day.
The standard deviation was 18.9 texts. Round answers to 3 decimal
places where possible.
a. To compute the confidence interval use a distribution.
b. With 98% confidence the population mean number of texts per
day is between answer _______ and answer _______ texts.
c. If many groups...

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 134 students who averaged 25.9 texts per day.
The standard deviation was 21.5 texts. Round answers to 3 decimal
places where possible.
a. To compute the confidence interval use a distribution.
b. With 98% confidence the population mean number of texts per
day is answer ___ between and answers ___ texts.
c. If many groups...

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 130 students who averaged 38.8 texts per day.
The standard deviation was 21.5 texts. Round answers to 3 decimal
places where possible. a. To compute the confidence interval use a
distribution. b. With 98% confidence the population mean number of
texts per day is between and texts. c. If many groups of 130
randomly selected...

A researcher is interested in finding a 95% confidence interval
for the mean number of times per day that college students text.
The study included 125 students who averaged 36.6 texts per day.
The standard deviation was 21.6 texts. Round answers to 3 decimal
places where possible.
a. To compute the confidence interval use a ? z
t distribution.
b. With 95% confidence the population mean number of texts per
day is between and texts.
c. If many groups of 125 randomly...

A researcher is interested in finding a 90% confidence interval
for the mean number of times per day that college students text.
The study included 142 students who averaged 36.7 texts per day.
The standard deviation was 21.9 texts. Round answers to 3 decimal
places where possible. a. To compute the confidence interval use a
distribution. b. With 90% confidence the population mean number of
texts per day is between and texts. c. If many groups of 142
randomly selected...

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