In an effort to increase sales, a company is considering a new training program for its salesdepartment. An advertisement claims that the training program leads to a mean increase of $5000 inmonthly sales. To study the program's effectiveness, the company selects 20 sales representatives,randomly assigning 10 to the training program and 10 to serve as control. On average, therepresentatives who participated in the training brought in $8231 more in monthly sales than thecontrol, and the 95% confidence interval for the difference in means was (2799, 13663) dollars.Does this confidence interval provide convincing statistical evidence that the mean increase in salesis different from the advertised value?(A) No, because $0 is outside the interval the results are not statistically significant.(B) No, because $5000 is included in the interval the results are not statistically significant.(C) Yes, because $0 is outside the interval the results are statistically significant.(D) Yes, because the representatives were randomly assigned and $8231 is different from $5000.(E) Yes, because $8231 is inside the confidence interval the results are accurate.

The objective of the question is to determine whether the 95% confidence interval provides…

Answered: In an effort to increase sales, a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Correlation studies are often used to help determine whether certain characteristics are controlled more by genetic influences or by environmental influences. These studies often examine adopted children and compare their behaviors with the behaviors of their birth parents and their adoptive parents. One study examined how much time individuals spend watching TV (Plomin, Corley, DeFries, & Fulker, 1990). The following data are similar to the results obtained in the study. a. Compute the correlation between the children and their birth parents. b. Compute the correlation between the children and their adoptive parents. c. Based on the two correlations, does TV watching appear to be inherited from the birth parents or is it learned from the adoptive parents?
Find a 95% confidence interval for the percentage of stocks with a gain.
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Mandrake Falls High School is experimenting with a weekend course in laboratory techniques. Of the 200 students enrolled in lab classes at Mandrake, only 78 have been able to take the techniques course. Mandrake is interested in evaluating the course's effectiveness in propagating safety in the laboratories. During regular lab classes, lab instructors have recorded harmful lab incidents: accidents, misuse of lab equipment, etc. The school is looking at the data and examining two variables: laboratory performance ("involved in no incident", "involved in exactly one incident", or "involved in 2+ incidents") and status regarding lab techniques course ("took the techniques course" or "didn't take the techniques course"). The contingency table below gives a summary of the data that have been gathered so far. In each of the 6 cells of the table are three numbers: the first number is the observed cell frequency (f); the second number is the expected cell frequency (E) under the assumption…
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