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Bob takes an online IQ test and finds that his IQ according to the test is 134. Assuming that the mean IQ is 100, the standard deviation is 15, and the distribution of IQ scores is normal, what proportion of the population would score higher than Bob? Lower than Bob?
Find the test statistic P-value, and critical value, and state the final conclusion.
A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
Identify 5 variables of interest to healthcare managers. Select and define one variable and include your rationale for selecting this variable. What is the difference between a dependent and independent variable?
Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 30. Change the number from 30 to 10 and recalculate the confidence interval.
What are examples from the workplace related to how data are collected and displayed to facilitate the determination of probability in the resolution of business-related and marketing problems?
The kinds of statistical methods that were used to formulate the author's argument.
The value of R-square indicates the amounts of variation in the dependent variable that is explained by the independent variable.
Your supervisor has asked you to conduct a survey about consumers' buying habits. For this task, you surveyed 100 men and 100 women at a local shopping mall.
They are asked if they use a laptop in class to take notes. Suppose that based on the survey, 220 of the 400 students responded "yes". a) What is the value of the sample proportion ^p ? b) What is the standard error of the sample proportion?
sketch a histogram showing the population distribution - locate value of the population mean in your sketch and make an estimate of the standard deviation.
Let S = {c, h, j, q, t, y} be a sample space of an experiment and let E = {c, h}, F = {c, q, y}, and G = {h, j, t} be events of this experiment. (Enter your answers using roster notation. Enter Ø for the empty set.)
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
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