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For 49 pairs of sisters, a researcher wanted to know whether the older sisters differ, on average, from the younger sisters, based on a test of social anxiety. It was found that D¯ = 3 and sD = 4.
Test the hypothesis of equal means with a Type I error probability of .05. Discuss the interpretation of the result.
Based on the results of the peliminary poll, how large a sample is required for the main poll, assuming that the main poll should have a margin of error of 3.3% and a confidence level of 96.7%.
A random sample of 85 group leaders, supervisors, and similar personnel at General Motors revealed that, on the average, they spent 6.5 years on the job before being promoted.
The lifetime of a disposable water filter is normally distributed with mean equals 30 gal and standard eviation equals 5 gal What is the probability that a filter selected at random will last from 25 gal to 30 gal.
What is the mean and standard deviation of the daytime waiting times? and what is the mean and standard deviation of the nighttime waiting times?
An auditor for Health Maintenance Services of Georgia reports 40% of policyholders 55 years or older submit a claim during the year. Fifteen policyholders are randomly selected for company records.
the next 2 questions refer to the following scenario. consider an experiment of flipping a fair coin 50 times. assign a
Let x be a random variable that represents a test score. What is the lowest score that would still place a student in the top 40% of the scores?
The article "The Gap Between Wine Expert Ratings and Consumer Preferences" (Intl. J. of Wine Business Res., 2008: 335-351) studied differences between expert and consumer ratings by considering medal ratings for wines, which could be gold (G), sil..
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld sound meter.
Problems 3, 4, 6, 7, and 8must be done by hand and on the computer using statistical software (SPSS or JASP). Copy and insert the results into your problem set at the appropriate place.
From the test data, can we determine whether the oven has an effect on the cake's density? The null hypothesis should be: Oven has no effect on density.
What is coefficient of dispersion? What purpose does it serve? Prove that the some of the squared deviations is least when taken from the mean.
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