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An advertisement for Cold-Ex claims an 40 percent end-of-treatment clinical success rate for the treatment of flu. 11 flu patients are given Cold-Ex and are later checked to see if the treatment was
Samples of the members of five different labor unions were asked whether they are for or against a certain piece of legislation:
The following data were collected for a test of linear correlation and Spearman's rank correlation was used:
What test is appropriate for this problem? State the null and alternate hypotheses Find the expected cell counts Find the test statistic How many degrees of freedom will you use? Find the critical v
Find the best predicted temperature at a time when a cricket chirps 3000 times in 1 minute. What is wrong with this predicted value?
A batch of 25 injection-molded parts contains five that have suffered excessive shrinkage. If two parts are selected at random, and without replacement, what is the probability that the second part
Is there convincing evidence that the majority of adult Americans prefer to watch movies at home? Test the relevant hypotheses using a 0.05 significance level. (For z give the answer to two decimal
200 draws are made with replacement from a box of numbered tickets. these tickets are labeled either -2 or3. is it possible for the expected value of the sum to be 50. justify your answer.
A fair six-sided die with numbers 1,2,3,4,5,6 is rolled independently 500 times. Approximate the probability that the sum is between 1720 and 1800.
A pearson's correlation coefficient of -.05 would represent a scatter plot in which:
A correlation coefficient has an associated probability value of .02 then;
The average number of vacation days per year offered by different US companies is skewed to the right. A random sample of 60 companies showed the mean number of vacation days was 22, and the standar
1. What would be the null hypothesis for a chi-square test based on this suspicion? 2. Under the null hypothesis, what is the value of the expected count for students who oppose the proposed change
Sketch and determine the area under the standard normal curve that lies
A professor is doing a study of the relationship between students grades and their part-time work. He analyses data from a random sample of 15 college students. the number of hours worked per week a
A researcher reports that the correlation between age and physical health of adults over 50 is -.69. One can conclude from this that
Which of the following statements regarding a negative correlation is true?
One method for assessing the effectiveness of a drug is to note its concentration in blood and/or urine samples at certain periods of time after giving the drug. Suppose we wish to compare two type
What are the null and alternative hypotheses for that test? What is the critical value for p=.05? If Dr. Henry calculates a test statistic of 1.59, should she? Retain H0 Reject H0
A manager wishes to determine whether the mean times required to complete a certain task differ for the three levels of employee training. He randomly selected 10 employees with each of the three l
In a study, subjects are randomly assigned to one of three groups: control, experimental A, or experimental B. After treatment, achievement test scores for the three groups are compared. The appropr
A regression of the amount of calories in a serving of breakfast cereal vs. the amount of fat in the cereal gave the following results: Calories = 97.1053 + 9.6525*(grams of fat). Which of the follo
Does this sample show there's a difference of distance? Test an appropriate hypothesis and state the conclusion. Create and interpret a 95% confidence interval
Test the appropriate hypothesis and state your conclusion. (Assume the Nearly Normal Condition is true.2) Create and interpret a 95% confidence interval.