5. A communications company has developed three new designs for a cell phone. To evaluateconsumer response, a sample of 120 college students is selected and each student is given allthree phones to use for one week. At the end of the week, the students must identify which of thethree designs they prefer. The distribution of preference is as follows:Design 1 Design 2 Design 3285438Do the results indicate any significant preferences among the three designs?

Answered: Image /qna-images/answer/7fd11882-4d2c-460c-8a27-adac467caa7a.jpg

Answered: 5. A communications company has…

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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To determine if people's preference in dogs had changed in the recent years, organizers of a local dog show asked people who attended the show to indicate which breed was their favorite. This information was compiled by dog breed and gender of the people who responded. The table summarizes the responses. Female Male Total 73 59 132 49 47 96 Yorkshire Terrier Dachshund Golden Retriever Labrador Dalmatian 58 33 91 37 41 78 45 28 73 86 67 153 Other breeds Total 348 275 623 Does a person's gender appear to be independent of what dog breed they like most? Explain your answer. @ 2 W S X a BIUA-A-LEEE 12pt # 3 e d C C $ 4 r f V % 5 t 9 A 6 b y h & 7 n O u * 8 m O k Paragraph Y ( 9 ✓ O alt 1 ) O P 4 ctrl fr ? 1 D Next } U 1 ( backs
A consumer agency wants to determine which of two laundry detergents, A or B, cleans clothes better. Fifty pieces of fabric are subjected to the same kinds of stains (grass, mud, coffee). Then 25 pieces are randomly assigned to be cleaned with detergent A and the remaining 25 pieces are cleaned with detergent B. After being laundered, the pieces of fabric are rated on a scale from 1–10, with 1 being the least clean to 10 being the most clean. The difference in mean ratings (A – B) was determined to be 1.5. Assuming there is no difference in the two detergents, 200 simulated differences in sample mean ratings are displayed in the dotplot. Using the dotplot and the difference in mean ratings from the samples, is there convincing evidence that the one detergent is better than the other? Yes, because a difference in mean rating of 1.5 or more occurred only 23 out of 200 times, meaning the difference is statistically significant and there is convincing evidence that A is more effective…
A manufacturing company that produces laminate for countertops is interested in studying the relationship between the number of hours of training that an employee receives and the number of defects per countertop produced. Ten employees are randomly selected. The number of hours of training each employee has received is recorded and the number of defects on the most recent countertop produced is determined. The results are as follows. Hours of Training Defects per Countertop 1 5 4 1 7 0 3 3 2 5 2 4 5 1 5 2 1 8 6 2 Copy Data The estimated regression line and the standard error are given. Defects per Countertop=6.717822−1.004950(Hours of Training)se=1.229787se=1.229787 Suppose a new employee has had 5 hours of training. What would be the 90% prediction interval for the number of defects per countertop? Round your answer to two decimal places.
A vaccine to prevent a severe virus was given to children within the first year of life as part of a drug study. The study reported that of the 3456bchildren randomly assigned the vaccine, 58 got the virus. Of the 1606 children randomly assigned the placebo, 46 got the virus. a. Find the sample percentage of children who caught the virus in each group. Is the sample percentage lower for the vaccine group, as investigators hoped? b. Determine whether the vaccine is effective in reducing the chance of catching the virus, using a significance level of 0.01.The first few steps of the hypothesis-testing procedure are given. Complete the procedure.
The principal at Tahoe Elementary School randomly selected three of the school's twelve classes of students to participate in an option poll. All of the children in each of the three randomly selected classes were asked the question, "What is your favorite fruit to eat?". The following results were obtained. Apples, Grapes, Apple, Apple, Banana, Apple, Apple, Grapes, Orange, Apple, Apple, Banana, Strawberries, Apple, Apple, Grapes, Apple, Orange, Apple, Apple, Apple, Apple, Grapes, Grapes, Apple, Orange, Apple, Apple, Banana, Apple, Apple, Apple, Strawberries, Apple, Orange, Grapes, Grapes, Apple, Grapes, Grapes, Grapes, Banana, Grapes, Banana, Apple, Banana, Grapes, Apple, Banana, Strawberries, Banana, Apple, Orange, Grapes, Orange, Grapes, Apple, Orange. Use the results of this opinion poll to estimate, with 95% confidence, the actual percentage of children attending Tahoe Elementary School whose favorite fruit to eat is Grapes. Express the estimate both symbolically and verbally.
A market research firm is investigating the appeal of three package designs. The table below gives information obtained through a sample of 200 consumers. The three package designs are labeled A, B, and C. The consumers are classified according to age and package design preference. Under 25 years 25 or older Total A 0.76 B 0.38 0.33 D 0.22 E 0.39 A Last saved 2:13:37 PM 22 54 76 B 34 28 If one of these consumers is randomly selected, what is the probability that the person prefers design A? 62 C 40 22 62 Total 96 104 200
As part of a class project a teacher brings a large jar containing 200 gum balls of 2 different colors, white and green to class. A student draws a sample of 20 gum balls, of which 4 are white and 16 are green. The students job is to estimate how many of the gum balls are white. A.) Use the sample to estimate the % of white gum balls in the jar. B.) Give the sampling proportion as a %. C.) If there were 60 white gum balls in the jar, give the parameter of white gum balls in the jar as a %. D.) Give the sampling error as a percent.
A manufacturing plant makes computer chips 24 hours a day. Employees work one of three, 8 hour shifts during the morning (2am-10am), day (10am-6pm), and night (6pm-2am). Below are data on the number of defective chips on a randomly chosen 24 hour period. Shift Morning Day Night Number of Defective Chips 23 26 47 Total Chips Manufactured 330 330 330 The plant manager thinks there might be more defective computer chips manufactured during the night shift compared to the day shift. Give appropriate statistical evidence to test the managers' claim.
A small college has been accused of gender bias in its admissions to graduate programs. a. Out of 500 men who applied, 255 were accepted. Out of 700 women who applied, 240 were accepted. Find the acceptance rate for each gender. Does this suggest bias? b. The college then looked at each of the two departments with graduate programs and found the data below. Compute the acceptance rate within each department by gender. Does this suggest bias? Department Men Women Applied Admitted Applied Admitted Dept A 400 240 100 90 Dept B 100 15 600 150 c. Looking at our results from Parts a and b, what can you conclude? Is there gender bias in this college’s admissions? If so, in which direction?

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