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Does the amount of hazardous material absorbed by the bodies of hazardous waste workers depend on gender? You want to test the hypotheses that the amount absored by men (group 1) is different from the amount absorbed by women (group 2). A random sample of 259 male workers and 118 female workers showed an average lead absorbtion in the blood of 14.65 (SD = 0.633) and 14.67 (SD = 0.794), respectively (measured in micrograms/deciliter). Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
1) Test Statistic: -0.262, P-Value: 0.3968
2) Test Statistic: -0.262, P-Value: 0.6033
3) Test Statistic: 0.262, P-Value: 0.7935
4) Test Statistic: -0.262, P-Value: 1.6033
5) Test Statistic: -0.262, P-Value: 0.7935
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
Verify that this is valid density function. Find out probability that weight is smaller than 24 ounces.
Illustrate the regression model and predict it. The following table shows the yearly maintenance costs for several cars, as well as their age.
The number of runs with respect to the sample median is:
What advantage does correlation have over a cross-tab?
At the .01 significance level, is there a difference in the use of the four entrances?
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
Prepare a power curve for this decision rule
She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.
Let C be the event that a diner gets the correct meal and let N be the event that a diner gets an incorrect meal. Find the probability that:
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