Question

(15%) For Applied Management Statistics class you want to know how college students feel about the...

  1. (15%) For Applied Management Statistics class you want to know how college students feel

about the transportation system in Barcelona.

  1. What is the population in this study?
  2. What type of sample would you use and why?

  1. (25%) A manager of an e-commerce company would like to determine average delivery time of the products. A sample of 25 customers is taken. The average delivery time in the sample was four days. Suppose the delivery times are normally distributed with a standard deviation of 1.2 days.

  1. Provide a 95 % confidence interval for the mean delivery time.
  2. The manager claims that the average delivery time of their products does not exceed 3 days. Write the null and alternative hypothesis regarding to the claim of  the manager.
  3. Test the manager’s claim at 95 % confidence level.
  4. Write the conclusion of your result

  1. (15%) For an effective parental skill study, a researcher asked: How many hours do your kids watch the television during a typical week in Barcelona? The mean of 100 Kids (ages 6-11) spend about 28 hours a week in front of the TV. Suppose the study follows a normal distribution with standard deviation 5.
  1. Estimate the mean of all kids (ages 6-11) in Barcelona, using 99% confidence interval. (show all the calculations)
  2. Write the conclusion of your result

  1. (25%) A regression analysis has been conducted between the annual income (in 1000 euros) and the work experience (in years) of people with 0.05 significance level. The results are summarized below.
  1. Define the independent and dependent variables. What can you say about the correlation between them.

  1. Interpret R Square.
  2. Write the regression model and interpret the coefficients.
  3. Estimate the average annual income of a person who has 15 years of work experience.

Summary

Table 1.

Regression Statistics

Multiple R

0,93

R Square

0,86

Adjusted R Square

0,82

Standard Error

2,11

Observations

6

Table 2.

df

SS

MS

F

Significance F

Regression

1

107,603

107,603

24,276

0,008

Residual

4

17,730

4,432

Total

5

125,333

Table 3.

Coefficients

Standard Error

t stat

p value

Lower 95%

Upper 95%

Intercept

17,351

3,160

5,491

0,005

8,577

26,124

Variable X 1

1,362

0,276

4,927

0,008

0,595

2,130

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A regression analysis has been conducted between the annual income (in 1000 euros) and the work...
A regression analysis has been conducted between the annual income (in 1000 euros) and the work experience (in years) of people with 0.05 significance level. The results are summarized below. Define the independent and dependent variables. What can you say about the correlation between them. Interpret R Square. Write the regression model and interpret the coefficients. Estimate the average annual income of a person who has 15 years of work experience. Summary Table 1. Regression Statistics Multiple R 0,93 R...
A university would like to know how their undergraduate students feel about taking a statistics class...
A university would like to know how their undergraduate students feel about taking a statistics class for the first time. To gain information about this question, the university performs a research study. Which of the following would be the most appropriate sample for the university to collect? Question 4 options: Data from all male students in college in the USA. Data from students in college in the USA. Data from senior college students who have taken at least one statistics...
A class survey in a large class for first-year college students asked, "About how many minutes...
A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 285 students was x⎯⎯⎯x¯ = 132 minutes. Suppose that we know that the study time follows a Normal distribution with standard deviation σσ = 65 minutes in the population of all first-year students at this university. Use the survey result to give a 95% confidence interval for the mean study time of...
SUMMARY OUTPUT Regression Statistics Multiple R 0.993709623 R Square 0.987458816 Adjusted R Square 0.987378251 Standard Error...
SUMMARY OUTPUT Regression Statistics Multiple R 0.993709623 R Square 0.987458816 Adjusted R Square 0.987378251 Standard Error 514.2440271 Observations 471 ANOVA df SS MS F Significance F Regression 3 9723795745 3241265248 12256.7707 0 Residual 467 123496711.4 264446.9194 Total 470 9847292456 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0% Intercept -267.1127974 42.01832073 -6.357055513 4.8988E-10 -349.68118 -184.54441 -349.68118 -184.54441 Fuel cost (000,000) 0.449917223 0.098292092 4.577349137 6.0451E-06 0.25676768 0.64306676 0.25676768 0.64306676 Salary (000,000) -0.327915884 0.188252958 -1.741889678 0.08218614 -0.6978436...
In a study about how much College students sleep at night, a sample of 25 students...
In a study about how much College students sleep at night, a sample of 25 students was selected. The sample average mean number of hours of sleep was 6.64 and the sample standard deviation was 1.075. (a) Construct a 90% confidence interval for the true mean number of hours of sleep at night College students get. (b) Interpret the interval. (c) What assumptions must be satisfied for the interval obtained in part (a) to be statistically valid?
A class survey in a large class for first-year college students asked, "About how many hours...
A class survey in a large class for first-year college students asked, "About how many hours do you study during a typical week?" The mean response of the 493 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours in the population of all first-year students at this university. Regard these students as an SRS from the population of all first-year students at this university....
A survey in a large class for first-year college students asked, "About how many hours do...
A survey in a large class for first-year college students asked, "About how many hours do you study during a typical week?" The mean response of the 461 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours for all first-year students at this university. Does the survey results provide evidence (at the 0.05 level) of students claiming to study more than 15 hours per...
Suppose you perform a study about the hours of sleep that college students get. You know...
Suppose you perform a study about the hours of sleep that college students get. You know that for all people, the average is about 7 hours. You randomly select 35 college students and survey them on their sleep habits. From this sample, the mean number of hours of sleep is found to be 6.2 hours with a standard deviation of 0.97 hours. We want to construct a 95% confidence interval for the mean nightly hours of sleep for all college...
A class survey in a large class for first-year college students asked, "About how many hours...
A class survey in a large class for first-year college students asked, "About how many hours do you study during a typical week?" The mean response of the 468 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours in the population of all first-year students at this university. Regard these students as an SRS from the population of all first-year students at this university....
Suppose you perform a study about the hours of sleep that college students get. You know...
Suppose you perform a study about the hours of sleep that college students get. You know that for all people, the average is about 7 hours. You randomly select 35 college students and survey them on their sleep habits. From this sample, the mean number of hours of sleep is found to be 6.4 hours with a standard deviation of 0.97 hours. You want to construct a 95% confidence interval for the mean nightly hours of sleep for all college...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT