A sales manager for an advertising agency believes there is a relationship between the number of contacts and the amount of sales. To verify this belief, the following data was collected: sales person | Numbers of contacts | sales (in thousands) 1 | 14 | 24 2 | 12 | 14 3 | 20 | 28 4 | 16 | 30 5 | 46 | 80 6 | 23 | 30 7 | 48 | 90 8 | 50 | 85 9 | 55 | 120 10 | 50 | 110 The standard deviation of the variable sales (in thousands) is about: 16.777 17.684 24.854 37.748 39.790
Added by Adrienne M.
Step 1
To do this, we add up all the sales and divide by the number of salespeople. Mean = (24 + 14 + 28 + 30 + 80 + 30 + 90 + 85 + 120 + 110) / 10 = 611 / 10 = 61.1 Show more…
Show all steps
Close
Your feedback will help us improve your experience
Federico Castro and 82 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Madhur L.
A sales manager for an advertising agency believes there is a relationship between the number of contacts and the amount of the sales. To verify this belief, the following data was collected: Salesperson Number of Contacts Sales (in thousands) 1 14 24 2 12 14 3 20 28 4 16 30 5 46 80 6 23 30 7 48 90 8 50 85 9 55 120 10 50 110 SUMMARY OUTPUT Regression Statistics Multiple R 0.975362147 R Square 0.951331317 Adjusted R Square 0.945247731 Standard Error 9.31044574 Observations 10 What is the value of the standard error of estimate? Select one: a. 8.328 b. 9.3104 c. 8.778 d. 86.68
A sales manager for an advertising agency believes there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned. A regression analysis shows the following results: Coefficients Standard Error t Stat p value Intercept -12.201 6.560 -1.860 0.100 Number of contacts 2.195 0.176 12.505 0.000 ANOVA df SS MS F Significance F Regression 1.00 13555.42 13555.42 156.38 0.00 Residual 8.00 693.48 86.68 Total 9.00 14248.90 X=33.4, Σ(X-X̄)²=2814.4. Rounding to one decimal place, the 95% confidence interval for 30 calls is _______. Multiple Choice a) 55.8, 51.5 b) 51.4, 55.9 c) 46.7, 60.6 d) 31.1, 76.2
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD