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A random sample of 40 part time workers has a mean annual earnings of $3120 and a population standard deviation of $677. Compute the 95% confidence interval for the mean.
Illustrate how critical values associate to the confidence interval using example variable. Explain how margin of error associates to confidence intervals and to ecology.
A nectarine-packing firm claims that the nectarines they ship have a mean weight of 5.22 ounces. A test on n = 10 randomly selected nectarines, gave the following results, in ounces:
You are the manager of a factory that produces Mini-Oats Cereal. The factory has an automated packaging machine that can be set at any targeted fill level between 12 and 32 ounces.
A researcher desires to estimate the difference in means of two populations. To accomplish this, she takes a random sample of 81 items from the first population.
The amount of time the university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
Find out the probability distribution of your net winnings if you play one time. Calculate the mean and the standard deviation.
What is an independent sample and what is a related sample? When should researchers use varying hypothesis tests for the different types of samples?
The following table describes the estimated green power sales by renewable energy in 2008: Develop a bar chart, pie chart, and Pareto Chart.
A Private firm reports that 8% of the 2 million small businesses who apply for loan each year receive special interest rate (usually higher than market rate) because of high riskiness associated with small business.
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
Discuss what is meant by mean, median, mode, variance, and standard deviation for a set of scores. Also mention under what circumstance you would use each of these.
Find the standardized test statistic to test the claim that mean1 = mean 2. Two samples are randomlu selected from each population. The sample statistics are given below.
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