Question

Among a random sample of 37 smokers, the average number of cigarettes smoked per day per person is 22.0 with a standard deviation of 10.8. Perform a test of significance to determine if it is likely that on average smokers will smoke more than 17 cigarettes a day.

a) H_0: mu (=, >, <, or not equal to) 17

H_a: mu (=, >, <, or not equal to) 17

b) Is the CLT for means valid? (yes/no)

c) Calculate the test statistic (use 4 decimal places for all calculations)

d) Calculate the p-value as accurately as table III allows.

e) At the alpha = .01 level do we reject or fail to reject the null hypothesis? (reject or fail to reject)

Answer #1

A study was performed to examine the habits of smokers, Of the
40 smokers surveyed average= 22.0 cigarettes a day, standard
deviation = 10.8 cigarettes a day. Use these sample statistics to
test whether or not the population mean differs from 20 cigarettes
(1 pack) a day.
a) Identify the population, variable, and parameter.
b) Does the CLT hold?
c) State the hypothesis:
Null h0: =
Alt: hA:
d) calculate test statistic
e) find p-value range
df= p >...

A comparison was made between number of cigarettes smoked in a
day by a sample of females and a sample of males.
Sex
female
male
N
32
18
Mean
6.74
4.32
StDev
7.36
5.52
SE Mean
1.3
1.3
(a) To start, we can write n1 = 32. Identify
each of the following, choosing from the numbers 18, 6.74, 4.32,
7.36, or 5.52 to fill in each of the blanks.
n2
=
s1
=
s2
=
x1
=
x2
=
(b)...

The National Retail Federation commissioned a national survey in
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had
done some Christmas shopping that weekend, the average amount
spent
was reported to be $343.31 and the standard deviation was
$151.32
Use the appropriate confidence interval to test if the average
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level. (use 4 decimal...

Cigarette Smoking A researcher found that a
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is there enough evidence to support her claim? Assume that the
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P-value method and tables.
Compute the test value....

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A. down
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In the left column below are listed...

A sociologist studied gender differences in the average number
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I need to know if this is right or left tailed and what
the P-Value is!
For the following, Use the five-step approach to hypothesis
testing found on page 8-16. It states. You can use excel to compute
the data or you can do it by hand. The YouTube videos provided in
the links will walk you through the steps to complete the following
problems.
State the hypothesis and identify the claim.
H0:
H1:
Find the critical value and determine...

17. The average cost of providing a particular service per
person per day is a random variable having a normal distribution
with average of N$100 and a standard deviation of N$22. This is an
illustration a
Select one:
A. Discrete Probability Distribution
B. Continuous Probability Distribution
18.
If you use the information provided in Question 3.1 to calculate
the probability that the cost of providing the service will be
at least N$120 per day per person., then :-
Select one:...

You are the researcher and you develop a hypothesis. It states
that by providing relaxation therapy to a group of 10 smokers who
average 20 cigarettes a day, you hypothesize that they will reduce
the number of cigarettes they smoke after eight weeks of therapy.
You will take measurements on the group you have provided
relaxation therapy to after eight weeks and the mean is 16
cigarettes. You compare the mean to two other groups who did not
receive the...

2. Sales at a fast-food restaurant average $6,000 per day. The
restaurant decided to introduce an advertising campaign to increase
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the average daily sales were $6,300 per day. From past history, the
restaurant knew that its population standard deviation is about
$1,000. If the level of significance is 0.05, have sales increased
as a result of the advertising...

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