6. A company has the head office at Kolkata and a branch at Mumbai. The personneldirector wanted to know if the workers at the two places would like the introduction of a new plan of workand a survey was conducted for this purpose. Out of a sample of 500 workers at Kolkata, 62% favoured thenew plan. At Mumbai, out of a sample of 400 workers, 41% were against the new plan. Is there anysignificant difference between the two groups in their attitude towards the new plan at 5% level ?

Two proportion Z test : A two proportion z-test is employed to check for a distinction between two…

Answered: 6. A company has the head office at…

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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2. A researcher wants to measure the job satisfaction levels of the employees of two fast food company located in Manila. The researcher has used a questionnaire consisting of ten questions related to job satisfaction levels of the employees. The researcher has used a rating scale from 1 to 4 where 1 is the lowest score and 4 is the highest score. So, a maximum score of 40 and a minimum score of 10 can be obtained. The researcher has randomly selected 15 employees from the first company and 17 employees from the second company. The scores obtained from these employees are given below: First Company: 32 40 31 33 32 30 30 32 31 32 34 32 38 32 28 Second Company: 25 28 23 27 24 26 27 22 25 26 34 25 23 22 29 27 24 Taking 5% as the alpha level, examine the significant difference in terms of job satisfaction level between the employees of the two companies.
Suppose we want to estimate the proportion of the Helena population who have used marijuana within the last month. We select 4328 participants and ask them each to first privately draw a card from a standard 52-card deck. If they get a “club” they are asked to respond truthfully to the question “Have you used marijuana within the last month?”If they get any other suit they are asked to respond to the question “Does your phone number end in an odd digit?”The study is blinded in the sense that the researcher doesn’t know which question the participant is answering. Hence, participants are guaranteed anonymity and are more likely to be truthful in their responses. The researchers only get a “yes” or “no” answer from each respondent and don’t know the actual results of the card draw. What is the expected probability of a person’s phone number ending in an odd digit? What is the expected probability of a person’s phone number not ending in an odd digit?
A TA in statistics thinks that the format of the conferences and the timing of the assignments may affect students' assignment marks (out of 10). He decided to design three conferences with a different format: (1) with lecturing, (2) with demonstrating problems, and (3) with involving students in active problem-solving. Twelve students attended one of the conferences (four in each format) and asked to submit their assignments at week 3. Another twelve students attended one of the conferences but asked to submit their assignments at week 5. The data are tabled below: Assignment Week 3 Week 5 Lecture 6,7,5,7 5,5,4,5 Format Demo problems 7,8,8,9 6,7,7,6 Active problems 9,10,10,10 8,9,9,10 Note: ΣΣΣx=1385 Perform the ANOVA test and table the results, stating all critical values. State and explain what should be the follow-up analysis after the overall F-test if any (NO calculation but just explain).
28) A study published in the American Journal of Public Health was conducted to determine whether the use of seat belts in motor vehicles depends on ethnic status in San Diego County. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) ethnic status (Hispanic or non-Hispanic) and (2) seat belt usage (worn or not worn) during the accident. The number of children in each category is given in the table below. Seat belts worn Seat belts not worn Hispanic 31 283 Non-Hispanic 148 330 Referring to these data, which of the following conclusions should be reached if the appropriate ni hypothesis is conducted using an alpha = .05 level? Tuoria enolzubaos griwollet Jo bidw ,20, of A) There is no relationship between whether someone is Hispanic and whether they wear a seat da srli to nabreg neowisd qilarrodslets al sist bel B) The use of seat belts and whether a person is Hispanic or not is statistically…
2. A researcher wants to determine which of three advertisements is most likely to encourage teens not to smoke. To assess the impact of each advertisement, she asks a sample of teenagers to view each ad and to rate the ad's effectiveness on a scale of 1 (not at all effective) to 7 (very effective). One ad used words only (no-cues condition), a second ad used a generic abstract picture (generic-cues condition), and a third showed a picture of a teen smoking and coughing (smoking-related cues condition). Fully test the question (5 steps) and determine the effect size. Participant ABCDEFG No Cues 2 3 1 4 4 5 2 T = 21 SS = 12 Generic Cues 5 5 4 5 3 4 2 T1 = 28 SS=8 Smoking- Related Cue 5 6 5 7 6 7 6 T2 = 42 SS = 4 P G = 91 ΣΧ2 = 451
Is the direction of the difference in the number of anagrams solved between the two groups consistent with theory of helplessness?
13. Consider a town in which 90% of the taxis are blue and 10% are green. One night a taxi hits a pedestrian and speeds off. A witness says.that the taxi was green. The pedestrian sues the Green Cab Co. The court orders a test of the witness's nighttime color perception. The test reveals that the witness correctly identifies 70% of blue color samples and 80% of green color samples. If a juror were to employ the representativeness heuristic to estimate the probability that the cab is green, he would overestimate that probability by the amount (a) 9/10 (b) 33/70 (c) 4/7 (d) 8/35 (e) 10/21
12. In a survey, 1015 individuals were classified by gender and whether they favor, oppose, or have no opinion on a complete ban of smoking in public places. Is opinion on banning smoking independent of gender? If the answer is no, explain the nature of the association. Ban smoking in public places Gender Favor No Opinion Орpose 231 Total Male 262 10 503 Female 302 205 5 512 Total 564 436 15 1015
10. For adults, certain type of cancers can be treated with multiple health interventions. To gain information about all Maryland-based treatment centers a survey is sent to a randomly chosen group of 25 Maryland based treatment centers that asks about the recommended interventions for cancer patients based on medical records, insurance, and income. All of the randomly selected treatment centers completed the survey. The sample is: For adults, certain type of cancers can be treated with multiple health interventions. To gain information about all Maryland-based treatment centers a survey is sent to a randomly chosen group of 25 Maryland based treatment centers that asks about the recommended interventions for cancer patients based on medical records, insurance, and income. All of the randomly selected treatment centers completed the survey. The sample is: a. the 25 Maryland-based treatment centers b. the medical records, insurance, and income c. all Maryland-based treatment…
3. A newly graduate of administration of justice has been hired by the regional director of the FBI to take a poll of a residential area to determine the proportion of residents who would be opposed to a gun exchange program in their community. The regional director of the FBI told her that if 50% or more of the residents are opposed to the idea, a gun exchange program will not be implemented. She takes a random sample of 150 household heads in the community and find that .42 of those sampled are opposed to the idea. Build a 99% confidence interval around this point estimate. Is 50% within her interval? What would she advise the regional director of the FBI who hired her?
Based on the Tukey Post-Hoc table (above), is there a significant difference between the text and video groups?Based on the Tukey Post-Hoc table (above), is there a significant difference between the text and phone groups? Based on the Tukey Post-Hoc table (above), is there a significant difference between the video and phone groups?
9. In order to investigate a rumor that there is a greater than expected number of girls among the children of chemists, Science magazine conducted an informal survey of eight chemistry departments. A secretary in the chemistry department at Indiana University, Bloomington, thought there might be something to this rumor and made sure that every one of the 34 faculty members in her department who have children responded to the Science survey. Altogether these Indiana chemists have 53 (56%) girls and 41 (44%) boys. Is this evidence that chemists produce more girl babies than expected? What kind of data would you prefer before drawing this type of conclusion? Explain how your idea would make the evidence produced more convincing.

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