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The nonprofit recently engaged in a campaign to encourage elementary school children to read more. A previous study found that children in your community read in their free time for 48 minutes per day on average. You would like to find out whether the time spent reading among elementary school students increased after the campaign.
1. Now consider Scenario B. You survey 40 elementary school students on their current reading habits and find that they read 56 minutes per day on average. Assume the standard deviation of reading time per day is 38 minutes. Go through the six steps for testing a hypothesis.
Step 1: (Re)write the null and alternative hypotheses.
Step 2: You choose as the significance level.
Step 3: Calculate the test statistic.
Step 4: Find the critical value(s).
Step 5: Compare the test statistic to the critical value(s).
Step 6: State the conclusion.
Suppose that a X2 test of independence at the level of significance 0.05 is to be applied to the elements of a 2 x 2 contingency table containing 2n observation
Using the data for Problem 08.04, create the project schedule in MS Project. Be sure to use both the predecessor relationships and the resource assignments.
Consider what adverse effects might be caused by tax incentives to increase saving?
The standard serum cholesterol level for adult males is 200 mg/100 ml with a standard deviation of 16.67 mg. For a sample of 49 overweight men, the mean reading is 211 mg. Is serum cholesterol elevated in overweight men? Use a 0.05 significance..
the fill volume of an automated filling machine used for filling cans of carbonated beverage is normally distributed
A study of 20 worldwide financial institutions showed the correlation between their assets and pretax profit to be .86. At the .05 significance level, can we conclude that there is positive correlation in the population?
For a normal distribution with a mean of 169 and a standard deviation of 30, what is the z value (distance from the mean) for a random value to be 129?
in a market research study conducted by a local winery on white wine preference the following results were found. of a
It is suspected that a random variable has a normal distribution with a mean of 6 and a standard deviation of 0.5. After observing several hundred values, we find that the mean is approximately equal to 6 and the standard deviation is close to 0.5..
What is the variable of interest?- Is this sample random? If so, justify your answer. If not, describe a technique to obtain a random sample.
Calculate the profitability index for each project. (Do not round intermediate calculations. Round your answers to 2 decimal places.)
Reject H0 at β β = .01; there is evidence of a difference between the mean voter turnouts for urban, suburban, and rural precincts.
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