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Suppose it is know from past research that the average cold lasts 5.7 days with a standard deviation of 2.3. A researcher takes an SRS of 50 children at an elementary school who had a cold this past winter and found out how long their cold symptoms lasted. Assuming that the Central Limit Theorem applies, give the sampling distribution of X for n = 50.
If the person believes in ghosts, what is the probability that she has never had an encounter with a ghost?- What is the probability that the person believes in ghosts and has
For each of these workers, the income was known as well as the percentage of the work that was related to exportation. The regression slope estimate was 0.009, and the t-sta
An office manager wishes to estimate the mean time required to handle customer complaints. A sample of 38 complaints shows a mean time of 28.7 minutes with a standard deviat
Odometers measure automobile mileage. How close to the truth is the number that is registered?- State the null hypothesis, choose an alternative hypothesis, perform a t test,
Question 1. (Descriptive Statistics; 1 + 1 + 2 + 2 + 2 = 8 marks) Investment Returns: These data are the annual returns of 80 dividend stocks for the years 2005 and 2010. (i
If the level of significance is 0.05, what is critical value to set up the decision rule to test the claim that the liberal arts students perform better than engineering stu
A woman sued a computer keyboard manufacturer, charging that her repetitive stress injuries were caused by the keyboard. The injury awarded about $3.5 million for pain an
In random samples, 46 of 400 tulip bulbs from one nursery failed to bloom and 18 of 200 tulip bulbs from another nursery failed to bloom. Use the χ2 statistic to test the nu
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