4. Identify each study as being either observational or experimental. Write the reason for your answer. (a) A study was done on two groups of algebra students. Group A was given tutoring and study skills advice. Group B was not given any additional help. After weeks, the students took a test. The results of the two groups were compared. (b) Two groups of factory workers were randomly selected. The individuals in Group 1 worked the night shift. Group 2 individuals worked during the day. At the end of six months, each group was surveyed about job satisfaction.

4. Identify each study as being either observational or experimental. Write the reason for your answer. (a) A study was done on two groups of algebra students. Group A was given tutoring and study skills advice. Group B was not given any additional help. After weeks, the students took a test. The results of the two groups were compared. (b) Two groups of factory workers were randomly selected. The individuals in Group 1 worked the night shift. Group 2 individuals worked during the day. At the end of six months, each group was surveyed about job satisfaction.

Name: 4. Identify each study as being either observational or experimental.
Uploaded: 2024-03-20T07:07:12.000Z
Channel: Bartleby
Description: 4. Identify each study as being either observational or experimental. Write the reason for youranswer.(a) A study was done on two groups of algebra students. Group A was given tutoringand study skills advice. Group B was not given any additional hel

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A transportation engineer at OSU conducts a study on bus ridership to the 14th and Monroe bus stop near campus. They collect data from riders by surveying every 10th person who arrives at the bus stop, and end up with a sample of 138 people. For each person surveyed, they collect the following information: OSU student (yes/no) Distance traveled to get to campus (miles) Number of bus rides per week Satisfaction with bus service (very unsatisfied, unsatisfied, neutral, satisfied, very satisfied) What sampling scheme is the engineer using to collect data? Simple random sampling Stratified sampling Systematic sampling Convenience sampling
In the class poll from the beginning of the year, you were asked what color car you drive. The results are summarized below. aqua 3 beige/tan/gold 39 black 80 blue 44 green 21 orange 3 pink 1 purple 3 red 45 silver 63 white 74 yellow 1 What is the mode for this data set?
I am having some trouble with this homework question and the steps to fully understand it. choices for the first - ( aspirin or control )? choices for the second - ( one-fifth, half, four-fifths, or twice )? choices for the third - ( does or doesn't )?
You are designing an experiment using human subjects. The study will include 30 participants. Of these, 16 will be placed in the experimental group and the remaining 14 will be placed in the control group. In how many ways can you assign participants to the two groups?
A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance without blocking to test whether there is evidence of a significant difference in mean sales of different package designs. Use alpha=0.01. What is the conclusion for the null hypothesis that all treatment means are equal? O Do not reject HO. There is sufficient evidence to conclude that the average sales for all stores are not…
A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance with blocking (analyze this data as a complete block design) to test further whether there is evidence of a significant difference in mean sales of different package designs. Use alpha=0.01. What are the sums of squares for Blocks? Provide your answer to the nearest 2 decimal places.
Use the following for the next two questions: The Hershey Company wants to know if it is doing better in the US than its biggest competitor, Nestle, during their biggest sales month of October. A random sample of 50 US grocery stores are chosen and their October, 2020 sales records are collected. Let ???? and ???? be the true average sales in millions of dollars of Hershey and Nestle products sold in US grocery stores during October, 2020 respectively. The 95% confidence interval for ???? − ???? from our sample data is (54, 346) millions of dollars What is the difference in the sample means ??̅?? − ??̅??? Round to the nearest whole number. 200
A clinical psychologist wants to test the effectiveness of three new therapies that have been developed for reducing anxiety symptoms. The researcher recruits 15 participants and randomly assigns them to take part in Therapy A, Therapy B, or Therapy C for a month. At the end of the month, the researcher measures the participants' anxiety symptoms on a scale from 1 to 10 (where a higher score means more anxiety symptoms). The participants' scores are shown below: What is the appropriate test to use ? 3. What are the null and alternative hypotheses ? 4. Using a two-tailed alpha of .05, determine what the critical value is 5. Calculate the test statistic 6. State whether you reject or fail to reject the null hypothesis for the omnibus test 7. Calculate and report the effect size for the omnibus test 8. Perform a Post-Hoc Test. Report the significance of each pairwise comparison
Please help. Thank you!
Brown wants to conduct an assessment of where employees live and how employees work. Brown wanted to know if where you lived was related to how you worked. What hypothesis tests can be used in this case?
I need help with 2, 3 and 6.
A teacher is concerned that she may be biased in her interaction with students. She keeps track of the number of interactions she has with her students and also notes the student's gender. She records the results in a contingency table. Interaction YES NO Boy 7 13 Girl 15 Is there a significant relationship between the interactions and the student's gender, using a = .05?