Question

You are given data on number of radio ads and sales for a local department store. You had observations for 20 months. The correlation between ads and sales is 0.40. Does this indicate a positive and significant relationship between ads and sales at the 5% level of significance?

a. There is not enough information to determine significance

b. No, because p value is 0.97.

c. Yes, because p value is 0.03.

d. No, because p value is 0.06.

Answer #1

A local grocery store wants to predict the monthly sales in
dollars. The manager believes that the amount of newspaper
advertising significantly affects the store sales. The manager
randomly selects 10 months of data consisting of monthly grocery
store sales (in thousands of dollars) and advertising expenditures
(in thousands of dollars). See the following data:
Is there a linear relationship between sales and the advertising
expenditures? if yes, is it positive or negative? is this
relationship strong? use the correlation...

Context: You own three Chick-Fil-A franchises. In your
sales district, you know that the average weekly sales are
$542,000. One of your stores (Clarkesville store) brought in an
average of $530,000 each week in the last year.
Assume that you conducted the most appropriate test and found
the following:
Z = 3.32
Lower Critical Value = -2.00
Upper Critical Value = 2.00
P-value = 0.0015
Level of significance = 0.05
-----------------------------------------------------------
1a) Based on this information, which of the following...

A skin care company has data on the monthly rainfall and the
sales of sun screen lotion for the 3 months of June, July, and
August for the last 20 years. It has calculated the correlation for
the 60 pairs of values. The correlation, r, is –0.310
1. The critical value for testing correlation for this data at a
significance level of 0.05 (rounded to 3 decimal places) is:
2. What is the appropriate conclusion for a hypothesis test at...

Using the data given below, calculate the linear correlation
between the two variables x and y.
X
0
3
3
1
4
y
1
7
2
5
5
(a)
.794
(b)
.878
(c)
.497
(d) .543
Refer to question 4. Assume you are using a 0.05 level of
significance; is there a
significant
relationship between the two variables x and y?
Yes
(b) no
The heights (in inches) and pulse rates (in beats per minutes)
for a sample of 40...

As the marketing manager for TriFoods, you want to determine
whether store Sales (number sold in one month) of TriPower bars are
related to the Price (in cents) of TriPower bars and in-store
Promotional expenditures (in dollars) for TriPower bars. You
conduct a multiple regression analysis with store Sales (Y) as the
response variable, and Price (X1) and Promotion (X2) as explanatory
variables. Use the Excel regression output below to answer the
questions.
Sample size 34, equation: Sales = 5837.5208...

The following data was collected to explore how the average
number of hours a student studies per night and the student's GPA
affect their ACT score. The dependent variable is the ACT score,
the first independent variable (x1) is the number of hours spent
studying, and the second independent variable (x2) is the student's
GPA. Effects on ACT Scores
Study Hours GPA ACT Score
4 3 31
4 3 30
3 3 18
2 2 17
2 2 17
Step...

A social gerontologist believes that there is a connection
between the weekly number of hours elderly people spend
volunteering and life satisfaction. They conducted a study and
collected the following data.
Participant
Weekly Hours
Volunteering
Level of Life
Satisfaction
A
12
16
B
10
30
C
3
5
D
5
7
E
18
42
F
7
10
G
22
51
* Volunteer Hours was measured by asking the
participants , "On average, how many hours do you volunteer each
week?"_______...

The average number of people in a family that received welfare
for various years is given below. (Source: House Ways and Means
Committee, Health and Human Services Department)
Year
Welfare family size
1969
4.0
1973
3.6
1975
3.2
1979
3.0
1983
3.0
1988
3.0
1991
2.9
Use “year” as the independent variable and “welfare family size”
as the dependent variable, Answer from your excel sheet:
a) Calculate the least squares line. Put the
equation in the form of: y=a-bx. To...

The following data was collected to explore how the average
number of hours a student studies per night and the student's GPA
affect their ACT score. The dependent variable is the ACT score,
the first independent variable (x1) is the number of hours spent
studying, and the second independent variable (x2) is the student's
GPA.
Effects on ACT Scores
Study Hours
GPA
ACT Score
1
2
17
2
3
18
3
4
20
5
4
31
5
4
31
Step...

Wait-Times (Raw Data, USE SOFTWARE):
There are three registers at the local grocery store. I suspect the
mean wait-times for the registers are different. The sample data is
depicted below. It gives the wait-times in minutes.
Register 1
Register 2
Register 3
2.0
1.8
2.1
2.0
2.0
2.1
1.1
2.2
1.8
2.0
1.9
1.5
1.0
1.8
1.4
2.0
2.1
1.4
1.0
2.2
2.0
1.5
2.1
2.2
The Test: Complete the steps in testing the
claim that there is a difference...

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