A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 5 in each sample.The rats in the first sample serve as a control and do not get any of the drug. The rats in the second group receive a small dose, and the rats in the third groupeach get a large dose of the drug. The psychologist records the activity level for each animal. The data from this experiment are presented below.no drugsmall doselarge dose2201O22321Complete the F-ratio table below.Source of VarianceSSBetween GroupsWithin GroupsTotal53223dfMSFP-value

State the hypotheses. There is no evidence to conclude that there is a significant difference…

Answered: A psychologist would like to examine…

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 new over-the-counter medicine to treat a sore throat is to be tested for effectiveness. The makers of the medicine take two random samples of 25 individuals showing symptoms of a sore throat. Group 1 receives the new medicine and Group 2 receives a placebo. After a few days on the medicine, each group is interviewed and asked how they would rate their comfort level 1-10 (1 being the most uncomfortable and 10 being no discomfort at all). The results are below. Find the 95% confidence interval in the difference of the mean comfort level. Is there sufficient evidence to conclude that the new medicine is effective? Assume the data is normally distributed with unequal variances. (Round answers to 4 decimal places) Make sure you put the 0 in front of the decimal. Average Group 1 = 5.84, SD Group 1 = 2.211334, n1 = 25 Average Group 2 = 3.96, SD Group 2 = 2.35372, n2 = 25
An experimenter investigated the effects of blue light exposure on people’s sleep quality. Researchers get 50 people and randomly assign 25 people to be exposed to blue light for 20 min. before bed and the other 25 people to have no blue light exposure 25 min. before bed. Each participant is sent to bed at 10pm and woken up at 7am the next morning. When all participants are woken up, they must fill out a sleep quality questionnaire. The scores seen below represent participants’ sleep quality ratings where higher numbers indicate better sleep quality. Does the blue light exposure negatively impact sleep quality? Blue light No Blue light 11 13 14 16 10 14 11 17 8 13 15 14 12 15 13 18 9 12 11 12 1. Analyze the data by hand or with SPSS/PSPP/JASP using the most…
Can a person train to become better at holding their breath? An experiment was designed to find out. Twelve volunteers were randomly assigned to 1 of 2 groups. The 6 volunteers assigned to group 1 were given breath-holding exercises to perform for 2 weeks. The other group was not given any information about the experiment. At the end of the 2 weeks, all 12 volunteers were individually tested to determine how long they could hold their breath. Here are the data (in seconds). Group 1: 90, 88, 70, 110, 75, 105 Group 2: 40, 48, 35, 50, 55, 62 The researcher would like to determine if these data provide convincing evidence that the true mean amount of time volunteers who were given training held their breath is greater than volunteers without training. Let μ1 = the true mean amount of time that volunteers who were given training held their breath and μ2 = the true mean amount of time that volunteers without training held their breath. What are the appropriate hypotheses? H0: μ1 – μ2…
An experiment is conducted to investigate the toxic effect of three chemicals, A, B, and C on the skin of rats. Three adjacent 1-inch squares are marked on the backs of 8 rats and each of the 3 chemicals is applied to each rat. The squares of the skin are then scored from 0 to 10, depending on the degree of irritation. The data on the outcome of the experiment are given in the following table: Rat 1 2 3 4 5 7 1.0 A B C| Rank A Rank B Rank C 6 5 3 11.5 6.0 1.5 9 8 4 23.0 20.0 3.0 6 11.5 23.0 1.5 6.0 20.0 11.5 16.5 20.0 23.0 6.0 16.5 11.5 11.5 16.5 6.0 11.5 6.0 16.5 5 6 7 8 Σyi 1.0 9 3 8 6 8 9 7 6 7 5 7 50 57 43 10 5 6 6 5 10 For the original data set 1-1 ij = 150, and ₁1-13 = 1006. From the ranks of the original data set the rank sums are RA = 97.5, RB = 128, Rc = 74.5 respectively. At a = 1%, is there sufficient evidence to support the research hypothesis that the probability distributions of skin irritation scores for the 3 chemicals differ in location? (a) Stating relevant…
Juvenile ground squirrels respond to predators by making “alarm calls” that can alert others to danger. A biologist conducted a study to investigate how squirrels respond to these alarm calls: run to burrow or freeze. The biologist played recordings of alarm calls for three samples of ground squirrels, grouped by age, and observed the squirrels’ responses. The data for the three age levels are shown in the table. Run to Burrow Freeze Total 1 to 5 Days Old 21 18 39 6 to 15 Days Old 16 24 40 16 to 25 Days Old 12 7 19 Total 49 49 98 If ground squirrels at different ages respond to the alarm signals in the same proportions, what would be the expected count for 6- to 15-day-old squirrels that freeze?
You may need to use the appropriate technology to answer this question. The Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to full-service restaurant chains.t One of the variables in the study is meal price, the average amount paid per person for dinner and drinks, minus the tip. Suppose a reporter for a local newspaper thought that it would be of interest to her readers to conduct a similar study for restaurants located in her city. The reporter selected a sample of 8 seafood restaurants, 8 Italian restaurants, and 8 steakhouses. The following data show the meal prices ($) obtained for the 24 restaurants sampled. Italian Seafood Steakhouse $13 $16 $24 13 18 19 15 17 23 16 26 25 17 22 22 19 15 21 17 18 26 26 20 32 Use a = 0.05 to test whether there is a significant difference among the mean meal price for the three types of restaurants. State the null and alternative hypotheses. O Ho: Hitalian = HSeafood = Hsteakhouse H: Not all the population…
A study is conducted to determine the effect of walnuts on concentration. Subjects were given 1 tablespoon of walnuts and asked to perform a memory test. Scores for the test were recorded in Excel. What is tool in this scenario?
A researcher is interested in whether a new antidepressant drug D has an effect on people's self-rating of depression. She randomly assigns 12 people into two groups so that each group has 6 people. One group is given drug D daily, and the other group is not given drug D. Call these the Drug group and the No Drug group, respectively. After one month of treatment, all 12 people were asked to rate on a scale from 1 to 7 how depressed they felt, where 1 = not depressed at all and 7 = very depressed. The following are the data: Drug No Drug 2 4 3 5 4 5 4 4 2 6 3 6 nD = 6 nND = 6 MD = 3 MND = 5 sD = 0.89 sND = 0.89 Using an α-level of .05, perform a two-tailed t-test to determine whether there was an effect of Drug D on depression ratings. Specifically, answer the following questions: What is the total degrees of freedom for this problem? Calculate the standard error of the…
A researcher is interested in determining if sleeping more hours the night before an exam will improve student math practice test scores. She randomly divides the class into two groups. One group is instructed to sleep 9 hours. The other group is instructed to sleep 6 hours. Students were asked to complete a practice math test the following day. The researcher then compares the average test score of each group. What is the DV? O the class O the researcher average test score O sleep (9 hours vs 7 hours)
A new cream was developed to reduce the irritation caused by poison ivy. To test the effectiveness, researchers placed an ad online asking for volunteers to participate in the study. One hundred subjects replied and were informed that one group would receive the new cream and the other group would Which of the following accurately describes the benefit of comparison in the experiment? O The overall level of irritation can be compared to see if the new cream had a significant effect. O The level of irritation for both groups can be receive a cream with no active ingredient. All 100 subjects were exposed to poison ivy. Fifty were then randomly assigned to the group with the new cream, and 50 were randomly assigned to the group with the cream with no active ingredient. After three days, the subjects' level of irritation was measured. compared to see if the new cream had a significant effect. O The level of irritation in the treatment group only can be compared to see if the new cream had…
Suppose you are comparing the time to relief of three headache medicines -- brands 1, 2, and 3. The time to relief data is reported in minutes. For this experiment, 15 subjects were randomly placed on one of the three medicines. Which medicine (if any) is the most effective? The data for this example are as follows: Brand 1 Brand 2 Brand 3 X X 24.5 28.4 26.1 23.5 34.2 28.3 26.4 29.5 24.3 27.1 32.2 26.2 29.9 30.1 27.8 A) Complete the ANOVA summary table: Sum of Degrees of Mean Brands Squares Freedom Square F p-value (Between) Error (Within) Total B) Interpret the results (write an APA style results paragraph).
Dr. Slim developed a new drug he hypothesizes will cause people to lose weight. He randomly assigned participants into either the control group (no drug) or the experimental group (1 pill a day for two months). At the end of the 2ndmonth he weighed each participant and recorded the amount of weight loss (i.e., measured in pounds) since the beginning of the program. The results were as follows: control group experimental group 21 33 20 17 26 39 27 22 21 17 24 19 17 32 13 29 88 19 32 31 29 31 26 30 29 36 22 26 Analyze the data using an independent two sample t-test and interpret the results.

SEE MORE QUESTIONS

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS