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1. Research would like to analyze effects of humidity on eating behavior. It is known that laboratory rats normally eat average of µ = 21 grams of food each day. Research selects the random sample of n = 16 rats and places them in controlled atmosphere room in which relative humidity is maintained at 90%. 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 researcher conclude that humidity has significant effect on eating behavior? Use two-tail test with α = .05.
b. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
Use the t-distribution table to find the critical values for the indicated alternative hypothesis, level of significance, a and sample size n1 and n2. Assume that the sample are independent, normal and random. Ha: u1
What is the role of the F test in multiple regression? (b) How is the F statistic calculated from the ANOVA table? (c) Why are tables rarely needed for the F test?
Compute the expected return and standard deviation of each of the two securities. Assume Miss Maple invested $2,500 in Security A and $3,500 in security B. Calculate the expected return and standard deviation for her portfolio.
The average diameter of sand dollars on a certain island is 3.60 centimeters with a standard deviation of 0.90 centimeters. If 36 sand dollars are chosen at random for a collection
Crystal Ball requires the following steps:
Duplicate readings, using two separate instruments, were obtained on ten samples. What is the tabular value of the statistic used to determine the significance of the mean difference at the .05 level of probability?
Based on these data, does it seem that strength of relationship between sales and promotions expenditures is enough to permit using linear regression forecasting model? Describe why?
Find the mean and standard deviation for the population and population of exam scores
LSAT scores are normally distributed, with a mean of 150 and s = 10.
The mean weight of newborn babies in a Long Island Community is 7.5 lbs with a standard deviation of 1.4 lbs. What is the probability that a random sample of 49 babies has a sample mean weight of at least 7.2lbs?
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution.
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribution of the battery lives closely follows the normal probability distribtion with a standard deviat..
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