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Suppose that an eBay power seller has had an average customer approval score of 83.4 out of a total of 100 points for the past 6 or 7 years. This year, the seller decided to offer free shipping in order to boost the approval score.
The seller offered free shipping to 25 customers for randomly selected products and then collected and reviewed the customers' approval scores. What type of statistical analysis is most appropriate to determine whether the offering of free shipping resulted in a significant increase in approval score?
What key feature distinguishes nonparametric from parametric tests? What are some advantages and disadvantages of nonparametric testing?
a pair of fair 6-sided die one green one red are rolled. let x be the number on the green die y be the number on the
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
according to the national retail federation 34 of taxpayers used computer software to do their taxes for the 2009 tax
how many commuters must be randompy selected to estimate the mean of driving time of chicago commuters? we want 98
One group was enquired, questions what they saw. One group was enquired, "About how fast were cars going when they smashed into each other?"
Can you conclude that engineers follow an accident profile that is different from the rest of the drivers in the region?
A sequence of n independent sample pH determinations will be made. Suppose each sample pH is a random variable with expected value m and standard deviation .1.
In one state, 52% of the voters are Republicans, and 48% are Democrats. In a second state, 47% of the voters are Republicans, and 53% are Democrats. Suppose a simple random sample of 100 voters are surveyed from each state. What is the probability..
How much time should be allowed if we wish to ensure that at least 9 out of 10 students (on average) can complete it? (round to the nearest minute).
if we roll a pair of fair 6 sided die let y denote the difference between the two outcomes on the two different dice.
An auditor for a Health Maintenance service of Georgia reports 40% of policyholder 55 years or older submit a claim during the year. Fifteen policyholders are randomly selected for company records.
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