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A research would like to examine the effects of humidity on eating behavior. It is known that laboratory rats normally eat an average of µ = 21 grams of food each day. The research selects a random sample of n = 16 rats and places them in a controlled atmosphere room in which the relative humidity is maintained at 90%. The daily food consumption scores for rats are as follows:
14, 18, 21, 15, 18, 18, 21, 1816, 20, 17, 19, 20, 17, 17, 19
a) Can the researcher conclude that humidity has a significant effect on eating behavior? Use a two-tail test with α = .05.
b) Compute the estimated Cohen's d and r2 to measure the size of the treatment effect.
Interpret a scatter diagram - Explain the relationship between the hours each student of a school spends in after school jobs each week and their grade average.
Describe the mean difference that is the main effect for the treatment. Describe the mean difference that is the main effect for gender. Is there an interaction between gender and treatment? Explain the answer
Oxytocin is a naturally occurring brain chemical that is nicknamed the "love hormone" because it seems to play a role in the formation of social relationships such as mating pairs and child-parent bonding.
In selecting a sample from a population for the purpose of making and inference from the sample about the population, it is important
Which of the given signifies difference in two population proportions?
Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.
Construct the 95% confidence interval for the proportion of students with at least one injury.
Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?
What is the expected number of customers that will have to wait more than 6 hours?
Explain in words general pattern of correlation is statistically important.
A portfolio p of consisting 60% of stock X and 40% of stock Y, has a correlation ρpM = 0.62 with the market. What is the portfolio volatility? Statement on the diversification effect.
Find out the test statistic s and its two-sided P -value. Do data give good evidence that population mean is not zero?
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