Question
In: Statistics and Probability
A researcher is interested in finding a 95% confidence interval for the mean number minutes students...
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 133 students who averaged 41.3 minutes concentrating on their professor during the hour lecture. The standard deviation was 13.3 minutes. Round answers to 3 decimal places where possible.
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 133 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 mean minutes of concentration and about percent will not contain the true population mean minutes of concentration.
Solutions
orchestra answered 2 years agoRelated Solutions
A researcher is interested in finding a 95% confidence interval for the mean number minutes students...
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
41 students who averaged 34.7 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.
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A researcher is interested in finding a 90% confidence interval for the mean number minutes students...
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
128 students who averaged 42.3 minutes concentrating on their
professor during the hour lecture. The standard deviation was 10.7
minutes. Round answers to 3 decimal places where possible.
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distribution.
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A researcher is interested in finding a 99% confidence interval for the mean number minutes students...
A researcher is interested in finding a 99% confidence interval
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25
28
22
19
15
20
7
27
23
6
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t distribution.
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15
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13
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16
25
9
6
24
13
a. To compute the confidence interval use a ? t
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You are interested in finding a 95% confidence interval for the mean number of visits for...
You are interested in finding a 95% confidence interval for the
mean number of visits for physical therapy patients. The data below
show the number of visits for 13 randomly selected physical therapy
patients. Round answers to 3 decimal places where possible.
17
6
7
9
7
15
15
11
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14
26
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A researcher is interested in finding a 90% confidence interval for the mean number of times...
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