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a) Determine the proportion of instances that the duration was less than 240 seconds. Also express the proportion as a percent.
(hint: proportion is number of successes divided by total number.)
b) Calculate the 95% confidence interval of the proportion. What is the margin of error?
c) Calculate the 90% confidence interval of the proportion.
d) For a 95% confidence level and a margin of error of 3% (0.03), how many samples are needed?
Choose a group of 4 adults at random. What is the probability that none of them enjoy drinking beer?
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
A bag of jelly belly candies contains the following colored jelly beans: red (10), blue (2), orange (5), brown (21), green (0), and yellow (18). Construct the probability distribution for x.
Do hotel managers on average vary significantly in femininity score from men in general?
Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. Here are data on the "penetrability" of the same type of soil at 2 levels of compression.
Find out 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
The Pearson Product-Moment Correlation Coefficient (r) is a measure of linear relationship between two variables.
What is the numerical value of the sample proportion p^ ? The P-value is the probability of what event?
Based on these data, does it seem that strength of relationship between sales and promotions expenditures is enough to permit using linear regression forecasting model? Describe why?
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
Be sure to include information about how you would use the concept of probabilities to apply to profiles for hiring more satisfied individuals.
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