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Comparing dexterity-test scores of workers on the day shift versus those on the night shift, the production manager of a large electronics plant finds that a sample of 37 workers from the day shift have an average score of 73.1, with a standard deviation of 12.3. For 42 workers from the night shift, the average score was 77.3, with a standard deviation of 8.4. Assuming the population standard deviations are equal, use the 0.05 level of significance in comparing the average scores for the two upon approaching the front desk. In particular, she is concerned that desk staff might be providing female guests with less prompt service than their male counter- parts. In observing a sample of 34 male guests, she finds it takes an average of 15.2 seconds, with a standard deviation of 5.9 seconds, for them to be greeted after their arrival at the front desk. For a sample of 39 female guests, the mean and standard deviation are 17.4 seconds and 6.4 seconds, respectively. Assuming the population standard deviations to be equal, use the 0.05 level of significance in examining whether the population mean time for serving female guests might actually be no greater than that for serving male guests. Using the appropriate statistical table, what is the most accurate statement we can make about the p-value for the test?
of 20 rats in a cage 12 are males and 9 are infected with a virus that causes hemorrhagic fever. of the 12 male rats 7
What is the percent difference between the two amounts relative to the amount for mathematics majors (round to the nearest percent)?
What is/are the advantage(s) of conducting a study with three or more levels of independent variables?
270 randomly selected light bulbs were tested in a laboratory 98 lasted more than 500 hours. find a point estimate of
data on the number of occurrences per time period and observed frequencies follow. compute the value of the test
The objective is to maximize the expected net return. Define the optimal value function and give the optimality equation. Find the optimal policy.
How do you find the z-score corresponding to a score of X = 100 for the distributions given below? How do you know what direction they are going?
And a standard deviation of 10 inches. What is the probability that the mean annual precipitation during 25 randomly Picked years will be less than 109.8 inches?
substrate concentration in mgcm3 of influent to a reactor is normally distributed with mean 0.3 and standard deviation
What can you infer from the statistics and what information might lead you to a different conclusion - what additional information would be valuable to help draw a more certain conclusion?
Qualitative Data Analysis
What is the probability that a randomly selected student in the university is female or majors in mathematics or both?
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