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You volunteer some of your spare time to your local fire department and have been asked by an assistant chief to analyze data on firefighters who applied for promotion. The assistant chief wants to ensure that gender bias is not a concern in the promotion of firefighters. Shown below is data for 50 firefighters who applied for promotion and the results of a chi-square analysis of the data.
Male Female
Promoted 13 22
Not Promoted 10 5
Chi-Square Statistics 3.6845
PValue 0.054919
When are differences (between one time period and another, between different production lines, etc.) between average or actual results important?
For each of the following situations, specify the mean of the sampling distribution of the difference in sample proportions.
One of them is weighted and has a 90% probability of landing on heads. You randomly choose one of the 100 coins. Find the probability that it is a weighted coin
In a recent study, 584 out of 875 people were able to pass the test. Find a test statistic for the proposition.
A linear correlation coefficient very close to 0 implies that there is a linear correlation between the averages, but a correlation between the averages does not imply a correlation between individuals as the conclusion incorrectly suggest.
The ages of circulating pennies are right skewed. Most circulating pennies were minted relatively recently, and extremely old pennies are rare. Assume the ages of circulating pennies have a mean of 12.2 years and a standard deviation of 9.9 years.
the weights in pounds of discarded plastic from a sample of households summary statistics are n62 x1.911 s1.065 use a
A patient is chosen at random from the clinic. What is the probability that the patient's test comes out positive for Lyme disease?
You are given the choice of three doors. Behind one is a new car and the others hide a barnyard animal for you to keep. After you choose door number one, your host (Monty) opens door three to reveal a goat.
Using the data for women, complete an analysis of CHD incidence in women similar to the one completed for men.
Draw a histogram showing the 20 sample means. (Use classes -0.5 to 0.5, 0.5 to 1.5, 1.5 to 2.5 and so on). Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
Even when the economy is holding steady, the unemployment rate tends to fluctuate because of seasonal effects. For example, unemployment generally goes up in Quarter 3 (summer) as students (including new graduates) enter the labor market.
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