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In an analysis of variance, the larger the differences between the sample means are, the larger the F-ratio will be?
A random sample of 100 people was taken. Eighty-five of people in sample favored Candidate A. We are interested in finding whether or not the proportion of population in favor of Candidate A is sign
In a study of length fo time that students need to earn bachelor degree 80 students are selected and they are found to have a mean of 48 years and standard deviation of 2.2 years develop a 99% confi
Skittles Original Fruit bite-size candies are multicolored candies in a bag, and you can "Taste the Rainbow" with their five colors and flavors; green, lime; purple, grape; yellow, lemon; orange, or
Determine a 98% confidence interval for porportion of deaths which occur in week before thanksgiving?
A survey asked "who do you consider to be best hitter in baseball? Of 493 major league players asked 355 said bonds. Construct a 95% interval for percentage of all players who think bonds is the bes
A national study has gathered data on number of hours that people work in week. The researcher would like to know if there are significant differences between men and women in amount that each work
A sample of the reading scores of 35 fifth graders has a mean of 82. The standard deviation of the population is 15. Find the best point estimate of the mean
Alex and Yan agree to meet at library between 5 pm and 5:30 pm to study. They will arrive independently. Let's call X the time after 5 pm when Alex arrives, and Y time after 5 pm when Yan arrives.
To reduce costs, a medical lab will pool blood to conduct one single test for the prevalence of a relatively rare disease. Assume that 5 people had their blood drawn.
The American insurance company found that 65% of residents of New York City had car insurance (C) with the company. Of these clients, 37% had a health insurance (H) with the company. If a resident i
A local school district recently implemented experimental program to improve mathematical skills for a specific high risk population. They selected 15 students to be in the initial study.
After examining a child at his two year check up, the boy's pediatrician said z-score for his height relative to american 2 year olds was -1.88. Write a sentence to explain to the parents what that
For an independent-measures ANOVA comparing three treatments with a sample of n = 5 in each treatment, what is the critical value for the F-ratio using a = .05?
Deelop an ANOVA comparing the anxiety levels (at posttest only) of participants across all three treatment conditions: CBT, psychodynamic, and supportive therapy.
A current random sample yielded the sample mean of 6490 psi. Conduct hypothesis test to find out whether the true mean MOR has changed from the target. Use a 0.10 significance level.
A researcher claims that the average age of people who buy lottery tickets is 61. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 9. At a = 0.05 is t
If other factors are held constant, which combination of sample characteristics would produce the narrowest confidence interval for a population mean?
Suppose that the population of heights of female college students is approximately normally distributed with mean m of 64.64 inches and standard deviation s of 6.02 inches. A random sample of 98 hei
If a "line of best fit" is placed among these points plotted on a coordinate system, would the slope of this line be positive or negative?
The following data lists the average monthly snowfall for January in 15 cities around the US:
Develop both an ungrouped and a grouped frequency distribution for the data given below:
A study is performed to discern if there is any difference in sitting heart rate between those who have two or less cups of coffee per day and those who have three or more cups per day. Subjects are
A confidence interval determine for the population mean is given to be (35.71, 44.14). If the standard deviation is 13.045 and the sample size is 52, answer each of the following (show all work):
A study was conducted to determine the mean amount spent on birthday gifts for typical family having two children. A sample of 190 was taken, and the mean amount spent was $234.01. Supposing a stand