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A producer of various kinds of batteries has been producing "D" size batteries with a life expectancy of 87 hours. Due to an improved production process, management believes that there has been an increase in the life expectancy of their "D" size batteries. A sample of 36 batteries showed an average life of 88.5 hours. Assume from past information that it is known that the standard deviation of the population is 9 hours. Give the null and alternative hypotheses. Compute the test and p-value. Use a=0.01 to make your conclusion based on the p-value.
Store used ANOVA to test if mean sales for each credit card were equal. What are the degrees of freedom for F statistic?
Determine the mean annual amount spent on household consumption per family with a sample of 100 families, an average amount of $8,000 spent, and if the population standard deviation is $500,
Write a hypothesis about the length of words in newspapers and magazines, Design and carry out an investigation to test your hypothesis.
Given the following data, 1) how do you make Excel create a scatter diagram for you? 2) If you were to draw a line through the points, how straight would the line be?
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
Using any present or past job related data, perform an ANOVA in either Excel or MegaStat. Write your null and alternate hypothesis. Post your ANOVA table. Interpret the results.
What is the probability all three of the selected homes have a security system?
An insurance agent has appointments with four prospective clients tomorrow. From past experience the agent knows that the probability of making a sale on any appointment is 1 out of 5.
Use a 95% CI to estimate the difference between the proportions of men and women managers who are married. Interpret the interval and what is the conclusion in terms of the populations from which the samples were drawn.
The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school.
what is the probability that at least 8 of the words on the test are words that the student knows?
The following table describes the estimated green power sales by renewable energy in 2008: Develop a bar chart, pie chart, and Pareto Chart.
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