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A survey was conducted two years ago asking college student their top motivations for using a credit card. To determine whether this distribution has changed, you randomly select 425 students and ask each one what the top motivation is for using a credit card. Can you conclude that there has been a chagne in the claimed or expected distribution? Use a =0.025.
At a .01 level of significance, test whether there is a difference between the 2 sample means. Construct a 99 percent confidence interval estimate of the difference between the two sample means.
Describe whether statements regarding statistical significance are true or false. When your results are found to be statistically significant, can one conclude that they will have a meaningful effect in the clinic.
An automobile assembly line operation has a scheduled mean completion time of 2.2 minutes. Because of the effect of completion time on both preceding and subsequent assembly operations, it is important to maintain the 2.2 minute mean completion ti..
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
Suppose that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more?
The average hourly wage last year for members of the hospital clerical staff in a large city was $6.32. The standard deviation of the population was $.54. This year a sample of 50 workers had an average hourly wage of $6.51. Test the claim at alph..
The professor plots a histogram of these several proportions. Should a Normal model be used to represent the sampling distribution of the proportion of tails?
The post anesthesia care area (recovery room) at St. Luke's Hospital in Maumee, Ohio was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25.
Construct a 98% confidence interval for the average life expectancy of countries around the world. The data appear to be normally distributed.
State a type I error and describe why it happens. Describe the factor that researcher can control to change type I error. Also, describe how type I errors can be avoided.
What type of probability distribution is presented? Find the probability that exactly 5 of his saplings will die in that first winter. Round to 4 decimal places. Find the probability that 5 or less of saplings will die in that first winter. Round to ..
The world's smallest mammal is the bumblebee bat. Shown to the right are weights(in grams) from a sample of those bats. Use the traditional method and significance level of .05 to test the claim that these bats come from the same population having..
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