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A researcher is performing a two-way ANOVA using two factors. The first factor has 5 levels and the second factor has 6 levels. In the ANOVA Summary Table, the degrees of freedom for the first and s
If the correlation coefficient r is equal to 0.362, find the coefficient of nondetermination.
A coin is biased so that when flipped it lands heads 75% of the time and lands tails 25% of the time. Flip this coin 8 times. What is the probability. (hint:binomial probability)
Flip a coin 3 times in a row. Let x be a random variable indicating how many times heads shows up.
A financial investment increased in value by 33.1% after one year, and then its value remained flat, no change, the next year; finally, its value decreased by 27.1% after the third year. What was th
What are the null hypothesis and the alternative hypothesis? Should the office building purchase the new brand of florescent bulbs? (i.e. test your hypothesis using a z-test)
Does the data provide compelling evidence for concluding that true average power for the Head raquet is different that the power for the Prince raquet? Test the appropriate hypotheses using the P-va
The information is summarized below. At the .01 significance level, is there a difference in the mean number of times men and women send a Twitter message in a day? What is the value of the test sta
What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.) Reject H0: µ ? 9.5 and fail to reject H1: µ < 9.5 when the tes
Is the value t = 2.12 statistically significant at the 10% level? At the 5% level?
The one-sample t statistic from a sample of n = 15 observations for the two-sided test of
Find the mean of this sampling distribution of sample means. Find the standard error of the mean of this sampling distribution of sample means.
In one college, heights of male students are approximately normally distributed with a mean of 68 inches and standard deviation of 4 inches. A random sample of 36 students is obtained and the heigh
The proportion of all children that drew the nickel too small is: redx.gif Assume that this proportion is true for ALL children (e.g. that this proportion applies to any group of children), and that
Give an example of how you may use a correlation or simple regression to examine the relationship between two variables in your area of interest. State the null and alternative hypothesis and clearl
A study of commuting times reports the travel times to work of a random sample of 18 employed adults in New York State. The mean is x= 25.46 minutes and the standard deviation is s = 20.8 minutes.
To address this question, the professor gathers information from the students in an undergraduate course and calculates their propensity for cooperating with the police (higher number means higher l
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days. If a gestation period of 276 days, what percentile among human
Test the significance of the correlation coefficient r at a = 0.05 for the data below.
Compute the standard error of the estimate for the data below.
A multiple regression line was calculated in which x1 was a student's grade point average and x2 was a student's age. The multiple regression line was calculated as y' = -18.7 + 46.3 x1 + 7.28 x2. I
What are the appropriate null and alternative hypotheses for this analysis? Using ?=0.05, what is your conclusion about the equality of population means all four coupons?
What is the value of y' when x = 3, if the equation of the regression line is y' = 23.1 - 3.8x ?