Part 1)Suppose the researchers collect data with the following summary statistics:Sample size MeanSDControl group114.81.12'Bad economy' group124.991.11Compute the test statistic for the two-sample t-test here, giving your answer to two decimal places.Part 2)The P-value (or p-value) of a test statistic is the probability of observing a value of the test statistic at least as inconsistent with the nullhypothesis as the value observed, assuming the null hypothesis is true. Find the P-value of the test statistic you found above, giving youranswer to three decimal places.

Answered: Image /qna-images/answer/30b9b463-7d77-4bfc-ab72-821f07983267.jpg

Answered: Part 1) Suppose the researchers collect…

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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1
Which of these scenarios means that a pretest-posttest design with a non-equivalent control group is not suitable? Select all that apply. O a. All of the available participants will be receiving the intervention at the same time. O b. Authors want to examine for any trends in the data over time. O c. The participants were placed into the experimental and control groups by natural circumstances rather than random assignment. O d. Authors want to compare averages between two groups before and after the intervention using an ANOVA.
12) Please provide a correct answer with a full method explanation and do not copy and past from other similar questions.
we look at a random sample of 1000 united flights in the month of December comparing the actual arrival time to the scheduled arrive time. computer output of the descriptive statistics for the difference in actual and expected arrival time of these 1000 flights are shown below : N=1000 Mean =4.06 St Dev. = 45.4 SE Mean =1.44 Min= -35 Q1 = -14 Median = -5 Q3 =9 Max =871 what is the sample mean difference in actual and expected arrival times? what is the standard deviation of the difference ? x bar = and s= ?
B. A sample data has a distribution that has a single mode and is strongly positively skewed. An analyst computes three measures of location for this data; the mean, the median and mode. (i) State the largest of these three location measures. (ii) Suggest, with a reason, which would be the best measure of location.
Acne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.
A researcher finds the following sample values: 2, 8, 6, 2, 7, 3, 4, 4, 5, 6, 7 At the .03 level, is there evidence to indicate the mean differs from the population mean of 2.15? 1. Critical Value (start with negative and separate with a comma if there are 2) 2. Test statistic 3. 3-decimal p-Value 4. Where is the test statistic on the graph Put: L-Left, M-Middle, R-Right
6. Explain the reasoning behind announcing one's choice of using a one-tailed test before performing the statistical analysis on an observed data set.
Describe a study in which you can use both nonparametric and parametric statistics. A researcher has participants expecting to receive either painful or mild electrical shocks during a study wait in a quarter-full waiting room with other participants. He then measures whether they choose to sit next to other participants or if they sit far away on their own. What is the best test to run for this study and why?
Suppose an education administrator wants to know whether the test scores of a new standardized graduation exam are different for males and females. To test this hypothesis, the administrator decides to perform a ?‑test for two independent means. She takes a random sample of test scores from both male and female populations. Some of the summary data are shown in the table. Population PopulationDescription Samplesize Samplemean (pts) Sample standard deviation (pts) 1 Female ?1=21 ?⎯⎯⎯1=34.3 ?1=3.09 2 Male ?2=22 ?⎯⎯⎯2=34.7 ?2=3.82 The administrator assumes that the population variances are equal, so she computes a pooled ?‑test statistic. Determine the number of degrees of freedom, df, for the pooled ?‑statistic.
Question 2 (CLO 2) Marks The following is the sample distribution for the age of computers used by Syarikat Timur Sdn. Bhd. Age (months) Number of Computers (f) 21-25 10 26-30 35 31-35 16 36-40 14 41-45 12 46-50 10 51-55 Based on the above information, find: a) Mean (9 marks) b) Mode (8 marks) c) Standard deviation (13 marks) d) Person Coefficient of Skewness (5 marks) e) Coefficient of Variation (5 marks)
What is the value of the standard score for the sample proportion?

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