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Professional pollsters are concerned with the growing proportion of refusals among potential survey subjects. Apriority suppose pollsters believe that the refusal rate is somewhere between 20 % to 30%
a. How large a sample do you need for X/n, the sample proportion, to have a margin of error of ±3% at the 95% confidence level?
b. Suppose among 312 large city residents sampled, 65 refused to cooperate. What is the margin of error at the 95% confidence level.
c. Pollster are interested in knowing if the refusal rate is universal or differs according community in which the subjects live. To test if there is a difference between city dwellers and rural residents, a study was done. The results for city dwellers are found in part (b) above and 51 refused to cooperate among 197 rural residents. Set up hypotheses and test at the 5% significance level to decide if there's a difference in the proportion of refusals in these two communities.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
For a sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, determine the sample mean?
Which of the following models satisfies the rules of probability and The event corresponding to the above system functioning properly during one period of operation is
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
Examined the effect of body position on blood pressure
Estimate the population mean
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
This model is fit to the data using the method of least squares using statistical software, and the following ANOVA table is obtained
Multiple comparison procedures are going to be done using the Bonferroni method with = 0.05. The value of t** is 2.4667. Which of the following is the appropriate conclusion from carrying out these multiple comparisons?
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