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When an experiment design has two factors but one factor involves related samples while the other factor involves independent samples, we should perform a:
A significant interaction effect indicates that: The influence of one factor is not the same for each level of the other factor.
Which of the following would not result in an increase in the power of ANOVA?
Distribution of all possible values of F regardless of whether H0 is true or false. Sampling distribution showing all values of F that occur when H0 is true and all conditions represent one population
In terms of hypotheses, one of the major differences between the t-test and ANOVA is that:
A sample of 230 observations is selected from a normal population for which the population standard deviation is known to be 24. The sample mean is 18. Determine the standard error of the mean
Run the Chi-Square test for independence using the calculator in the module. Note that StatCrunch does NOT support this type of Chi-Square.
The boy has tracked demand over his first few months and he has determined that the following probability distribution correctly captures the demand for sandwiches each day:
The maximum error of estimate is a function of three factors: the level of confidence, sample size and standard deviation. T-F, and why or why not? Explain the difference between a point estimate an
In Study Hall 3 of the 16 girls have red hair and 2 of the 15 boys have red hair. What is the probability of selecting a boy or a red haired person to run an errand for the teacher.
A rancher runs a closed herd of breedin cattle.He keeps and breeds the top 3%of bull calves based on individual performance for yearling weight. His sires avg 3 years of age when their offspring are
One article reports that in a sample of 355 calves less than 4 days old, 106 had lesions on their bronchial lymph nodes, while in a sample of 467 calves more than 4 years old, 147 had such lesions.
One article reports that in a sample of 413 male college students, the average number of energy drinks consumed per month was 2.49 with a standard deviation of 4.87, and in a sample of 382 female co
One article describes measurements of ammonium concentrations (in mg/L) at a large number of wells in the state of Iowa. These included 349 alluvial wells and 143 quaternary wells.
Clearly state the null and the alternative hypotheses. Perform the hypothesis test at level ? = 0.01 by computing the test statistic and the p- value.
A gasoline tank for a certain car is designed to hold 15 gallons of gas. Suppose that the actual capacity of a randomly selected tank has a distribution that is approximately normal with a mean of 1
Below are three sets of expected frequencies for the four cells of 2 X 2 contingency tables. Identify which statistical procedure would be appropriate for each, using the most conservative approach.
Using alpha = 0.05, test whether or not there is a significant difference between the preferences for the two candidates. Use alpha = 0.05.
The following data presents test scores on a Behavioral Vignettes Test for self-help skill teaching for the primary parents of a random sample of families with mentall retarded children before and a
Develop a 90% confidence interval estimate for the difference between the proportion of voters favoring each candidate. Does your confidence interval provide conclusive evidence that one of the candid
What is the minimum sample size required by this student, given that no prior estimate of the population proportion is available?
Use appropriate words and statistics to describe the statistical results. Based on this data which design should he use?
Run the Chi-Square test for independence using the calculator provided in the module. Note that StatCrunch does NOT support this type of Chi-Square.
The 2010 Chevrolet Camaro with an eight-cylinder engine and automatic transmission has a combined gas mileage of 19 mpg. What percent of all vehicles have better gas mileage than the Camaro?
Assume that the average full time college student in the U.S. requires a total of $10,500 per year to cover the costs of tutition, books and fees with a standard deviation of $1,300. If 50 full time