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Alexander and O'Hara (2010) conducted a study concerning the effects of parental interaction style on children's memory. They found that individuals with more elaborative parents had better memory. Their p value was .50. What does this mean in terms of a Type I error? To explain this, be sure to explain whether the null hypothesis should be rejected, the likelihood of that decision being an error, and why it might have been an error. What is the probability of a Type II error in this scenario? (Be sure to define and address this briefly.) "
How many adults must be randomly selected to estimate the mean driving time of Chicago commuters? We want 99% confidence that the sample mean is within 4 minutes of the population mean, and the population standard deviation is known to be 8 minute..
When using the distribution of sample means to estimate the population mean, what is the benefit of using larger sample sizes?
Identify the null hypothesis, alternative hypothesis, test statistic, p-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
Construct a 90% confidence interval for the mean percentage of hotel reservations being cancelled on the day of the booked stay that falls between 1.1%-3.4%.
Consider Obama's health care plan. There are = #s of males and females. 50% of the females approve (A) of the plan and 70% of the males do not approve (N) of the plan.
In the Willow Brook National Bank waiting line system (see Problem 1), assume that the service times for the drive-up teller follow an exponential probability distribution with a service rate of 36 customers per hour or 0.6 customer per minute.
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee to be dispensed?
A simple random sample is to be drawn from a population of 1200. To have 90% confidence that the sampling error in estimating p is no more than 0.03
The New York Times recently reported that 60% of college entrants into elite public and private colleges in the U.S. have parents that earn over $150,000/yr.
What is the probability that at least 8 of the next 15 errors are due to operator errors? What is the probability that no more than 3/10 failures are due to operators?
In an article appearing in Today's Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75
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