Question

Question 2

a. Find the point estimate of the average systolic pressure of all female in the population. [3 marks]

b. Construct the 95% confidence interval of the average systolic pressure of all female in the population. Briefly explain the confidence interval. [6 marks]

c. Determine the margin of error of estimate for part (b). [2 marks]

d. Find the 98% confidence interval of the average systolic pressure of all female in the population. What conclusion can be drawn from the above confidence interval? [6 marks]

e. State assumption(s) that you make. [2 marks] f. At α = 0.05, can we conclude that the average systolic pressure of all female differs from 128 mmHg? Use p-value approach. [11

This list explains the values given for the categories in the data set.

1. “Age” is given in years.

2. “Educational level” values are defined as follows: 0 = no high school 2 = college graduate 1 = high school graduate 3 = graduate degree

3. “Smoking status” values are defined as follows: 0 = does not smoke 1 = smokes less than one pack per day 2 = smokes one or more pack per day

4. “Exercise” values are defined as follows: 0 = none 2 = moderate 1 = light 3 = heavy

5. “Weight” is given in pounds.

6. “Serum cholesterol” is given in milligram percent (mg%).

7. “Systolic pressure” is given in millimeters of mercury (mm Hg).

8. “IQ” is given in standard IQ test score values.

9. “Sodium” is given in milliequivalents per liter per liter (mEq/l).

10. “Gender” is listed as male (M) or female (F).

11. “Marital status” values are defined as follows: M = married S = single W = widowed D = divorced

Assume this is all information given, please provide an answer.

Answer #1

[Questions 1-9]. Suppose a researcher wants to know if the
average systolic blood pressure in African Americans is different
from the averagesystolicblood pressure in the general
population.Note that the average systolic blood pressure in the
general population is 120 mmHG.The researcherrecruits25 African
Americans into this particular study and then measureseach of their
systolic blood pressures (mmHG).The sample mean blood pressure
is123with a sample standard deviation of 5.0.Note that we DO NOT
KNOW the population standard deviation of blood pressures (σ)....

6) A special diet is intended to reduce systolic blood pressure.
If the diet is effective, the target is to have the average
systolic blood pressure of this group be below 150. After six
months on the diet, an SRS of 15 patients with high blood pressure
was evaluated; the data are shown below along with a stem plot of
the data. Is this sufficient evidence that the diet is effective in
meeting the target? Answer in the blanks to...

QUESTION 1:
We want to estimate the mean change in score µ in the
population of all high school seniors. An SRS of 430 high school
seniors gained an average of x¯¯¯x¯ = 22 points in their
second attempt at the SAT Mathematics exam. Assume that the change
in score has a Normal distribution with standard deviation
48.114.
Find σx¯¯¯σx¯, the standard deviation of the mean change
x¯¯¯x¯. (±±0.001).
Using the 68-95-99.7 Rule (Empirical Rule), give a 99.7%
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The following data are collected from
virtual people living on an Island showing the systolic and
diastolic blood pressure (measured in mmHg) for 30 men and 30
women.
Serial number
Male
Systolic
Diastolic
Female
Systolic
Diastolic
1
M
157.8
91.0
F
157.4
90.3
2
M
160.5
90.7
F
154.8
89.4
3
M
157.5
88.1
F
155.4
91.8
4
M
169.4
94.3
F
168.4
94.2
5
M
160.1
90.2
F
163.0
90.5
6
M
160.5
92.9
F
158.2
90.8
7
M...

question 1. A marketing specialist wants to
estimate the average amount spent by visitors to an online
retailer's newly-designed website. From the data in a preliminary
study she guesses that the standard deviation of the amount spent
is about 16 dollars.
How large a sample should she take to estimate the mean amount
spent to within 4 dollars with 95% confidence? (Round your answer
up to the next largest integer).
______
question 2. Pepsi wants to use this technique
to...

Question 1:
Almost all employees working for financial companies in New York
City receive large bonuses at the end of the year. A sample of 63
employees selected from financial companies in New York City showed
that they received an average bonus of $ 61 , 000 last year with a
standard deviation of $ 16 , 000 . Construct a 98 % confidence
interval for the average bonus that all employees working for
financial companies in New York City...

****PLEASE ANSWER ALL OF FOUR QUESTIONS!!!!****
QUESTION 1: You are curious about the average number of
yards Matthew Stafford throws for each game for the Detroit Lions.
You randomly select 30 games and see that the average yards per
game is 269.1 with a standard deviation of 27.31 yards. You want to
create a 90% confidence interval for the true average number of
yards per game he throws. What is the margin of error for this
estimate?
QUESTION 2: You...

Question 1 (1 point)
You own a small storefront retail business and are interested in
determining the average amount of money a typical customer spends
per visit to your store. You take a random sample over the course
of a month for 8 customers and find that the average dollar amount
spent per transaction per customer is $106.745 with a standard
deviation of $13.7164. Create a 95% confidence interval for the
true average spent for all customers per transaction.
Question...

The population IQ score was collected from a national-wide test.
The mean population IQ score is 101 and with a stand deviation of
15. The data of original population follows the normal
distribution.
Use the Z-score table provided to answer the following
questions:
(1) What is the Z score for IQ score = 95?
Answer: (Please report your answer to 3 decimal
places.)
(2) What is the Z score for IQ score = 110?
Answer: (Please report your answer to 3 decimal...

QUESTION 1 [13 MARKS]
Write down only the letter corresponding to your choice next to
the question number.
1.1. A random variable that can assume only a finite number of
values is referred to as a
a) Infinite sequence
b) Finite sequence
c) Discrete random variable
d) Discrete probability function
e) All of the above
1.2 Which one of the following statements is incorrect?
a) A data set provides information about people, objects or
other entities.
b) If the possible...

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