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Assume that you hear a news report asserting the exsistence of a causal relationship between voter policy preferences and the voting behaviour of members of congress. What questions would you want to ask before you took this assertion seriously?
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
A dependent samples t test is typically more powerful than an independent samples t test because? Reduces participant/subject variability between groups.
There are 40 English students enrolled. The teacher questioned 5 students who always sit in the back of the classroom. Three of the 5 said "yes" when asked if they would like "A Tale of Two Cities" as the next class reading assignment.
What is the standard deviation of the sampling distribution of p(hat) the proportion of all rolls of the die that show a 1 or a 2? 3.) describe the shape of the sampling distribution of p(hat).
Assume a sample of 400 American adults were taken. Show the sampling distribution of the proportion of adults who balance their checkbook at least once a month.
According to the Internal Revenue Service, the mean tax refund for the year 2007 was $ 2,708. Assume the standard deviation is $ 650 and tha the amounts refunded follow a normal probability distribution.
Find the minimum sample size needed , using a prior study that found that 26% of the respondants said they planned to travel outside the US in next 12months.
The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 82 pounds. A random sample of 150 newly manufactured cables has a mean breaking strength of 1950 pounds.
Sample mean is 12.2 days and sample standard deviation is 10 days. How many personnel files would director have to choose to evaluate to within 2 days with 99% confidence interval?
Describe the sample distribution of p-hat, the sample proportion of college students with cell phones who send or receive text messages with their phones.
Identify each of the random variables as continuous or discrete.
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
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