Question
In: Statistics and Probability
An investigator wants to determine if a new exercise program aimed at reducing the overall mean...
- An investigator wants to determine if a new exercise program aimed at reducing the overall mean body weight among senior citizens is more effective than no exercise. A survey of 81 participants in the program finds their average body weight to be 150 lbs with a sample standard deviation of 9 lbs, while 100 senior citizens with no exercise had a sample bodyweight of 200 lbs with a sample standard deviation of 10 lbs.
- Complete the following to test the hypothesis that the mean body weight those wh exercised is less than that of those who did not.
Research hypothesis:
Ha: H0:
Test statistic
Critical value at α=.01.
Conclusion:
Possible error in terms of the problem:
- Construct a 95% confidence interval for the average body weight of senior citizens who did the exercise program,
Solutions
orchestra answered 2 years agoRelated Solutions
an investigator wants to determine if a new program aimed at reducing the overall number of...
an investigator wants to determine if a new program aimed at
reducing the overall number of pregnancies in a highly populated
area is effective (reducing average births below 6 per household).
In order to carry out the investigation, the investigator surveys
20 participants in the program and finds the average number of
births is 4.7 with a sample standard deviation of 0.9 births. carry
out a test of hypothesis to test the investigator’s claim by
answering the following with alpha=.01...
An investigator wants to test the effectiveness of a new weight loss medication at reducing BMI...
An investigator wants to test the effectiveness of a new weight
loss medication at reducing BMI (kg/m2). Suppose the
following table represents the results from a SRS of individuals
enrolled in the study. Assume a normal approximation is acceptable.
(α=.05)(6 points)
Patient
BMI Pre-Test (kg/m2)
BMI Post-Test (kg/m2)
A
30.5
26.5
B
32.8
28.5
C
35.6
28.4
D
34.7
25.7
E
33.9
29.4
A) What type of test design is this?
B) Write our your null and alternative hypotheses.
H0:µd=____ ,Ha:...
An investigator theorizes that people who participate in a regular program of exercise will have levels...
An investigator theorizes that people who participate in a
regular program of exercise will have levels of systolic blood
pressure that are significantly different from that of people who
do not participate in a regular program of exercise. To test this
idea the investigator randomly assigns 40 subjects to an exercise
program for 10 weeks and 40 subjects to a non-exercise comparison
group. After ten weeks the mean systolic blood pressure of subjects
in the exercise group is 137 and...
An investigator theorizes that people who participate in a regular program of exercise will have levels...
An investigator theorizes that people who participate in a
regular program of exercise will have levels of systolic blood
pressure that are significantly different from that of people who
do not participate in a regular program of exercise. To test this
idea the investigator randomly assigns 21 subjects to an exercise
program for 10 weeks. After ten weeks the mean systolic blood
pressure of subjects in the exercise group is 137 ( = 10). The mean
systolic blood pressure of...
An investigator theorizes that people who participate in a regular program of exercise will have levels...
An investigator theorizes that people who participate in a
regular program of exercise will have levels of systolic blood
pressure that are significantly different from that of people who
do
not participate in a regular program of exercise. To test this
idea the investiga tor randomly assigns 21 subjects to an exercise
program for 10 weeks and 21 subjects to a nonexercise comparison
group. After ten weeks the mean systolic blood pressure of subjects
in the exercise group is 137...
A factory wants to determine the effectiveness of a new shop floor safety program that they...
A factory wants to determine the
effectiveness of a new shop floor safety program that they recently
implemented. The company implements the safety program at 12 of its
factories and collects annual shop floor accident incidences both
before and after the safety program was put into operation in these
12 factories.
1-Specify the competing Null and Alternate hypotheses that you
will use to test the effectiveness of the shop floor safety
program
Null Hypothesis
Alternative Hypothesis
2-Is this a one-tailed...
A study was conducted to determine the effectiveness of a diet program in reducing weight of...
A study was conducted to determine the effectiveness of a diet
program in reducing weight of obeys people. Eight randomly selected
patients were put on this diet and the amount of weight losses (in
pounds) were recorded. Suppose the sample mean and the sample
standard deviation of weight losses were 38 and 4.598136 pounds,
respectively. Construct a 90% confidence interval for the average
weight loss and based on the confidence interval constructed
determine if you would expect to see an...
Problem 1: An investigator in a university wants to know the mean math SAT score among...
Problem 1:
An investigator in a university wants to know the mean math SAT
score among all the applications to the university this year
(denoted by μ). A random sample of n = 50 applications are
selected. The sample mean is X = 530 and the sample variance is s2
= 8100.
a. Consider the hypothesis testing problem: H0 : μ = 520 against
Ha : μ ̸= 520. Use a significance level of α = 0.05.
Compute the test...
The mean body mass index (BMI) for boys age 12 is 23.6. An investigator wants to...
The mean body mass index (BMI) for boys age 12 is 23.6. An
investigator wants to test if the BMI is higher in 12-year-old boys
living in New York City. How many boys are needed to ensure that a
two-sided test of hypothesis has 80% power to detect a difference
in BMI of 2 units? Assume that the standard deviation in BMI is
5.7
The marketing manager of a company producing a new cereal aimed for children wants to examine...
The marketing manager of a company producing a new cereal aimed
for children wants to examine the effect of the color and shape of
the box's logo on the approval rating of the cereal. He combined 3
colors and 2 shapes to produce a total of 6 designs. Each logo was
presented to 3 different groups (a total of 18 groups) and the
approval rating for each was recorded and is shown below. The
manager analyzed these data using the...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- What is covariation between two variables? How is "covariation" (or correlation) between two variables different from...
- Question 1: What is For Loop? Explain with 2 Examples. You can write code in any...
- If a corporation has limited capital to use for project investment, but it has more projects...
- I have a problem with my code. It does not run. Please can someone check the...
- As discussed in the text, in the absence of market imperfections and tax effects, we would...
- //This is an ArrayReverser Problem.. import java.util.Scanner; public class Main { public static void main(String[] args)...
- After completing its capital spending for the year, Carlson Manufacturing has $1,100 extra cash. Carlson’s managers...
ADVERTISEMENT