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suppose that in the setting of the previous exercise you are willing to settle for a margin of error of $1000. will the required sample size be larger or smaller? verify your answer by performing the the calculations.
It was thought that hypnosis would lower a person's desire to smoke. A researcher decided to investigate this hypothesis using a paired-sample sign test in which the number of cigarettes/day smoked by subjects was recorded before and after hypnosi..
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that:
Company wishes to know how many pounds of each chemical ingredient to put into the bag of fertilizer to meet minimum needs of 20 ounces of nitrogen, 36 ounces of phosphate, and 2 ounces of potassium during minimizing cost.
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
A random sample of 15 college graduates revealed that they worked an average of 5.3 years on the job before being promoted. The sample standard deviation was 1.2 years. Using the 0.95 degree of confidence, what is the confidence interval for the p..
Determine the margin of error that corresponds to the given values of n (times) and x (successes) and the degree of confidence: n=1400, x=420, 95%. Go 3 decimal places of precision.
The 30 members of an orchestra were asked how many instruments each could play. The results are set out in the frequency distribution. Calculate the mean number of instruments played:
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
Lewis earned 85 on his biology midterm and 81 on his history midterm. In the biology class the mean score was 79 with standard deviation 5.
A dietitian investigated whether apples washed in hot water or in cold water turned brown at different rates when exposed to air. She took 13 random apples and cut each in half.
Carry out the ANOVA and, if essential, post-hoc comparisons. Make a graph to represent group differences, and interpret ANOVA in a paragraph written in APA style.
The third will be made an offer only if the committee should reject both the first and the second. How many possible ordered choices of three out of six candidates are there?
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