Question

Suppose 5% of college students don’t use social media. We randomly sampled 1000 college students.

- Let X denote the number of students who don’t use social media
in this sample. Calculate the
**expected value**and the**standard deviation**for X. (4 pts) - Find the probability of observing 50 or less students who don’t
use social media in this sample. If you would like to use normal
approximation for binomial distribution, make sure to
**check the conditions**and you don’t need to do the continuity correction. (6 pts)

Answer #1

Suppose 5% of college students don’t use social media. We
randomly sampled 1000 college students. Let X denote the number of
students who don’t use social media in this sample. Calculate the
expected value and the standard deviation for X. Find the
probability of observing 50 or less students who don’t use social
media in this sample. If you would like to use normal approximation
for binomial distribution, make sure to check the conditions and
you don’t need to do...

Suppose 5% of college students don’t use social media. We
randomly sampled 1000 college students.
a. Let X denote the number of students who don’t use social
media in this sample. Calculate the expected value and the standard
deviation for X.
b. Find the probability of observing 50 or less students who
don’t use social media in this sample. If you would like to use
normal approximation for binomial distribution, make sure to check
the conditions and you don’t need...

A group of 42 college students from a certain liberal arts
college were randomly sampled and asked about the number of
alcoholic drinks they have in a typical week. The purpose of this
study was to compare the drinking habits of the students at the
college to the drinking habits of college students in general. In
particular, the dean of students, who initiated this study, would
like to check whether the mean number of alcoholic drinks that
students at his...

A group of 52 college students from a certain liberal arts
college were randomly sampled and asked about the number of
alcoholic drinks they have in a typical week. The purpose of this
study was to compare the drinking habits of the students at the
college to the drinking habits of college students in general. In
particular, the dean of students, who initiated this study, would
like to check whether the mean number of alcoholic drinks that
students at his...

A group of 41 college students from a certain liberal arts
college were randomly sampled and asked about the number of
alcoholic drinks they have in a typical week. The purpose of this
study was to compare the drinking habits of the students at the
college to the drinking habits of college students in general. In
particular, the dean of students, who initiated this study, would
like to check whether the mean number of alcoholic drinks that
students at his...

A group of 53 college
students from a certain liberal arts college were randomly sampled
and asked about the number of alcoholic drinks they have in a
typical week. The purpose of this study was to compare the drinking
habits of the students at the college to the drinking habits of
college students in general. In particular, the dean of students,
who initiated this study, would like to check whether the mean
number of alcoholic drinks that students at his...

A group of 53 college students from a certain liberal arts
college were randomly sampled and asked about the number of
alcoholic drinks they have in a typical week. The purpose of this
study was to compare the drinking habits of the students at the
college to the drinking habits of college students in general. In
particular, the dean of students, who initiated this study, would
like to check whether the mean number of alcoholic drinks that
students at his...

A group of 42 college students from a certain liberal arts
college were randomly sampled and asked about the number of
alcoholic drinks they have in a typical week. The purpose of this
study was to compare the drinking habits of the students at the
college to the drinking habits of college students in general. In
particular, the dean of students, who initiated this study, would
like to check whether the mean number of alcoholic drinks that
students at his...

Suppose that 200 students are randomly selected from a local
college campus to investigate the use of cell phones in classrooms.
When asked if they are allowed to use cell phones in at least one
of their classes, 40% of students responded yes. Using these
results, with 95% confidence, the margin of error is 0.068 0.068 .
How would the margin of error change if the sample size increased
from 200 to 400 students? Assume that the proportion of students...

BIOS 376 Homework 7
1. A professor claims that the mean IQ for college students is
92. He collects a random sample of 85 college students to test this
claim and the mean IQ from the sample is 84.
(a) What are the null and alternative hypotheses to test the
initial claim? (1 pt)
(b) Using R, compute the test statistic. Assume the population
standard deviation of IQ scores for college students is 17.6
points. (1 pt)
(c) Using R,...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 12 minutes ago

asked 12 minutes ago

asked 14 minutes ago

asked 30 minutes ago

asked 32 minutes ago

asked 32 minutes ago

asked 54 minutes ago

asked 54 minutes ago

asked 57 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 1 hour ago