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At work. Some business analysts estimate that the length of time people work at a job has a mean of 6.2 years and a standard deviation of 4.5 years.
a) Explain why you suspect this distribution may be skewed to the right.
b) Explain why you could estimate the probability that 100 people selected at random had worked for their employers an average of 10 years or more, but you could not estimate the probability that an individual had done so.
You are examining a brick manufacturing facility. The process has historically produced 5% nonconforming bricks. Calculate the expected value and standard deviation of the number of nonconforming bricks during a typical hour of production
A normal distribution has a mean of µ = 100 with σ = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 90 and X = 120?
Compute the standard error of estimate, and interpret its meaning.
A researcher wishes to estimate with 99% confidence, the proportion of adults who have high-speed Internet access. Her estimate must be accurate within 2% of the true proportion.
a. Construct an ordered stem and leaf display to sort the data. b. After examining the stem and leaf display prepared in a., comment on the possible distribution of the number of cases purchased by the supermarket chain.
Write the regression. Interpret the regression constant and regression coefficient. Forecast a value for monthly salary.
In a prospective study, Data collected extensive information on incidence of coronary heart disease (CHD) among smoker and non-smoker individuals.
What alternatives other than specific protection strategies might Larkin Oil consider (for example, insurance)?
a questionnaire sent through the mail as part of a market research study consists of eight questions each of which can
Form a frequency distribution and a percentage distribution that have class intervals with the upper class limits $99, $119, and so on.
If the selected coin is flipped twice and comes up heads twice in a row, what is the probability that the coin is two-headed?
What is the Spearman coefficient of rank correlation, what range of values can it have, and how is its numerical value interpreted?
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