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The director of a radio broadcasting company wants to determine whether the mean length of commercials on his station is equal to 24 seconds. He samples 200 commercials, and finds that the average length of these commercials is 26.3 seconds, with a standard deviation of 7.2 seconds. He uses a significance level of 5%. Test his claim. Show step by step on how you obtained your final answer.
The best estimator or appreciative of the population proportion is 0.45. How large must the sample be?
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
They want you to determine what the data indicate about this.In this problem I am having an issue trying to determine what equation to use to solve. Is this a one or two way ANOVA or should I just use a z-test to solve?
Compute the coefficient of multiple determinations.
Multiple choice questions based on regression - dependent variable Y and an independent variable X is provided.
Hypothesis testing of single mean - The Wall Street Journal reported that the 30-year mortgage rate is now less than 6%.
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
The distributor selects one cable at random from among all cables in stock. If the cable selected is found to meet the strength specifications, what is the probability that the cable was produced at Plant A?
What are the requirements that must be met for a regression analysis? What happens if these requirements are violated? Why is the analysis of residuals important?
If Z = 1.96, s = 3, and E = 1, determine the correct sample size.
You are asked to estimate the chance that the sum will be positive.
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