People who sustain a concussion or a traumatic brain injury (TBI) are likely to experience sleep problems. Do these problems persist over time? Researchers recruited a sample of 31 patients who had their first TBI 18 months earlier and a control group of 42 otherwise similar individuals without prior TBIs. They compared sleep duration per 24 hours for the 2 groups. Which test is most appropriate for this scenario? A 2-sample test for means B 1-sample z-test for proportion

Q: a research design where each person is tested in two different conditions is called what?

A: Between-subjects (or between-groups) study design: different people test each condition, so that…

Q: A repeated measures study uses a sample of n = 5 participants to evaluate mean differences among…

A: It is given that, A repeated measures study uses a sample of n = 5 participants to evaluate mean…

Q: Range anxiety is one of the reasons consumers are reluctant to switch to an electric vehicle, and…

A: Given information: x 89 90 91.5 92 92.5 95 95.5 96 93 93.5 94 94 91…

Q: b. Compute the test statistic. (Round your answer to 3 decimal places.) The test statistic is 2.892

A: The table helps to obtain the sample mean and sample standard deviation: Here, di=Before-After…

Q: a researcher conducts an experiment comparing two treatment conditions with 15 scores in each…

A: a)   From the given information,   There are 2 treatment groups and each group has 15 scores.   That…

Q: What is the alternative hypothesis in the problem? The average family family size in the Philippines…

A: Given The average family size in the philippines was reported as 4.30 Mean=μ=4.30 l.o.s.=α=0.10

Q: If a researcher reports a t-statistic with degree of freedom 19, how many individual subjects…

A: Given: Degree of freedom = 19

Q: what happens If the Levene's test is statistically significant?

A: Levene's test is an inferential measure used in statistics to determine the equality of variances…

Q: (Case Study) A group of children who lived near a lead smelter in El Paso, Texas, were identified…

A: The whiskers of the box plot indicate the upper and lower quartile.

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A:

Q: What does it mean if the cases are not selected randomly but are assigned randomly to groups?

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: DO STYROFOAM CUPS HOLD HOT OR COLD LIQUIDS BETTER? WHAT WILL BE YOUR CONTROL GROUP ? WHAT WILL BE…

A: The researcher wants to conduct an experiment to test if Styrofoam cups hold hot or cold liquids…

Q: What is the null and alternative hypothesis? Identify or explain in your own words.

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Q: If you have a sample size of 500, should you interpret the statistical significance or the effect…

A: Statistical Significance:Statistical significance, often represented by a p-value, indicates whether…

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A: Given: The population standard deviations of life expectancy are 8.2 and 8.6 for females and males…

Q: Does ginkgo improve memory? The law allows marketers of herbs and other natural substances to make…

A: Introduction: The study involved 350 volunteers over the age of 60 years. Each subject was assigned…

Q: Advantages of using a related sample (either one sample of participants with repeated measures or…

A: When the repeated measure design and matched subjects design are grouped, the related sample designs…

Q: randomized, double-blind, placebo-controlled study evaluated the effect of the herbal remedy…

A: For the echinacea group: Sample size (n1): 337 Mean severity score (x̄1): 6.0 Standard deviation…

Q: Suppose that the proportion of citizens in a local community who use bus transportation was reported…

A: The random variable X follows normal distribution. We have to test whether the proportion of bus…

Q: A researcher studying psychological well-being between those with depression, anxiety, or mood…

A: Given Information- Number of individuals for each type of psychological well-being are Depression =…

Q: You may need to use the appropriate technology to answer this question. In a completely randomized…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

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A:

Q: What is the formula for STANDARDIZED EFFECT SIZE, COHEN’S d (TWO INDEPENDENT SAMPLES)?

A:

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A: State the hypotheses. That is, there is no evidence to conclude that the sample proportion…

Q: Skittles claims that 30% of their candies are purple, 30% are green, 20% are orange, 10% are blue…

A: Solution: The given table of data is

Q: research team convened to study rare blood disorder in the adult population in New York. W

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Q: Under what circumstances can you use a z-test instead of a t-test to compare a sample against a…

A: t test and z-test are the statistical tests that are used to find if the value of the sample mean is…

Q: effect size of .7 and you want your power to be .40 ( significance level = .05)?

A: Given: Effect size, ES = 0.7 Power = 1 -  = 0.40 Significance level,  = 0.05 Sample size n = ?

Q: 19% of deaths among male adults can be attributed to heart diseases. Is this percentage different…

A: Solution: It is given that 19% of deaths among male students can be attributed to heart diseases.