Question

How much do students pay, on the average, for textbooks during
the first semester of college? From a random sample of
**400** students the mean cost was found to be
**$357.75**, and the sample standard deviation was
**$37.89**. Assuming that the population is normally
distributed, find the margin of error of a **91%**
confidence interval for the population mean.

Answer #1

For a random sample of 400 people, the mean cost for textbooks
during the first semester of college was found to be $371.75, and
the sample standard deviation was $38.44. Assuming that the
population is normally distributed, find the margin of error of a
90% confidence interval for the population mean.
please with explanation and which table you have used.

A survey is given to students to study the cost of textbooks
this semester. A random sample of 12 students had an average cost
of $284.90 and a standard deviation of $96.10. Find a 95%
confidence interval for the average textbook cost for all students
assuming the cost of textbooks are normal.

In a survey, 91 college students were interviewed about how
much
time they spent on school e-mail each week. The sample average was
3.34 hours with a sample standard deviation of 7.728 hours.
Construct a 90% confidence interval for the population mean. Also,
find the margin of error. Round your answers to 3 decimal
places.
Группа выборов ответов
(1.994,4.686) margin of error=1.346
(1.994,4.686) margin of error=2.692
(1.731,4.949) margin of error=1.609
(1.731,4.949) margin of error=3.218
(1.994,4.686) margin of error=3.340

Consider a sample of 30 college students from Victoria. Based on
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the population is normally distributed.
What is the upper confidence limit for an 88% confidence interval
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Express your solution rounded to two decimal places.

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