Question

Below you have data for three variables collected from a clothing boutique. The store features three lines based on price, budget, mid-range, and high fashion. The data below represents 40 items from those lines, the number of sales for each item, and the average liking score for each item based on a pre-sale focus group. Answer the following questions: 1) Using excel's formulas determine the mean, median, mode, standard deviation, and variance of the liking score. 2) Using Data Analysis, find the same values for number of sales. Liking scores: 3 3 2 4 3 3 3 3 3 1 2 3 4 2 4 4 2 3 2 3 3 4 4 2 4 4 3 3 3 3 4 3 3 3 4 3 3 3 2 4 Sales: 25 26 36 27 23 34 27 15 24 25 23 28 20 26 29 26 23 21 24 25 21 17 21 19 23 23 25 20 28 22 36 27 29 22 23 23 30 36 23 18

Answer #1

**Solution:-**

1)

The results of a sample of 372 subscribers
toWiredmagazine shows the time spent using the Internet
during the week. Previous surveys have revealed that the population
standard deviation is 10.95 hours. The sample data can be found in
the Excel test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
Develop a 95% confidence interval for the population mean
If the editors of Wiredwanted to have the...

Data set for ages of students in stats class:
17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,19,
20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23,
24, 25, 25, 25, 26, 26, 27, 28, 28, 28, 28, 29, 29, 32, 36, 42
1) Compute the 5-number summary and create a modified box-plot,
using the inner-quartile range to identify any outliers.

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process.
Does the sample data indicate a statistically significant
difference at the 5% level? Justify your answer....

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process. Does the sample data indicate a
statistically significant difference at the 5% level? Justify your
answer....

Sales data on three independent departments are summarized and
presented in the table below.
Department X
Department Y
Department Z
16
21
21
18
17
19
22
21
20
23
24
21
22
23
19
20
22
24
30
29
27
28
29
27
28
32
30
Do these data provide sufficient evidence to indicate a
statistical difference in sales? Assume the level of significance
is 5%. Show all the steps in hypothesis testing and all your
calculations.

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process. If the variance of XYZ remains unchanged,
what should be the variance of ABC in order...

____________________________________________
The results of a sample of 372 subscribers to Wired
magazine shows the time spent using the Internet during the week.
Previous surveys have revealed that the population standard
deviation is 10.95 hours. The sample data can be found in the Excel
test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
____________________________________________
Develop a 95% confidence interval for the population mean
____________________________________________
If the editors...

6. Using the class data (see Blackboard file - "Class Survey
Data - PSS-10 and GAS") calculate the correlation between the GAS –
Goal disengagement and the GAS – Goal reengagement scores. Write
the results in a statistical statement.
7. Using the class data calculate the correlation between the
GAS – Goal disengagement and the PSS-10 scores. Write the results
in a statistical statement.
8. Using the class data calculate the correlation between the
GAS – Goal reengagement scores and...

*in r studio file
4. The director of admissions of a small college selected 120
students at random from the new freshman class in a study to
determine whether a student’s grade point average (GPA) at the end
of the freshman year (y) can be predicted from the ACT test score
(x). Estimate the simple linear regression of, y = β0 + β1x + ε,
using gpa.txt data and answer the following questions. (4
pts each)
(c) Obtain a predicted...

A study was conducted to see if students’ writing skills
continue to improve as the academic year progresses. English 101
students were asked to write essays throughout the year in
September, December, March and June. The scores were compared to
see if there is any improvement in this one-year course. Was there
a significant improvement?
The appropriate test for this problem is:
one-way ANOVA
repeated measurements
Student
September
December
March
June
1
17
23
21
24
2
25
21
21...

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