Question

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 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.

Answer #1

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 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 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 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 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
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...

A fitness center is interested in finding a 95% confidence
interval for the mean number of days per week that Americans who
are members of a fitness club go to their fitness center. Records
of 237 members were looked at and their mean number of visits per
week was 2.5 and the standard deviation was 1.6.
a. To compute the confidence interval use a
distribution.
b. With 95% confidence the population mean number of visits per
week is between answer...

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...

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 fitness center is interested in finding a 95% confidence
interval for the mean number of days per week that Americans who
are members of a fitness club go to their fitness center. Records
of 245 members were looked at and their mean number of visits per
week was 2.4 and the standard deviation was 1.6. Round answers to 3
decimal places where possible.
a. To compute the confidence interval use a ? t
z distribution.
b. With 95% confidence the...

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