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1. A cognitive psycholgist believes that a particular drug improves short-term memory. The drug is safe, with no side effects. An experiment is conducted in which 8 ramdomly selected subjects are given the drug and then given a short time to memorize a list of ten words. The subjects are then tested for retention 15 minutes after the memorization period. The number of words correctly recalled by each subject is as follows: 8,9,10,6,8,7,9,7. Over the past few years, the psychologist has collected a lot of data using this task with similar subjects. Although he has lost the original data, he remembers that the mean was 6 words correctly recalled and that the data were normally distributed. On the basis of these data, what can we conclude about the effect fo the drug on short term memory? Use alpha = 0.05 two tail in making your decisison.
Please assist on solving this problem using the "t" test for single samples.
You have to determine that your cutoff value at level a = 0.05 is 1.645 when testing whether the mean of a population is significantly different from 1.5. If you calculate a test statistic of 1.8 what is the proper conclusion?
A certain component is critical to the operation of medical device and must be replaced immediately upon failure. If the mean lifetime of this type of component is 100 hours and its standard deviation is 30 hours, how many of these components must..
Give a brief definition and an example of the following: What does the correlation coefficient r describe? What about r squared?
Project was estimated by using ADM/PERT analysis. Due to extensive length of project many activities were combined; Following is the result.
Fifty raffle tickets are numbered 1 throughout 50, and one of them is drawn at random. What is the probability that the number is a multiple of 5 or 8? Consider the following "solution": Since 10 tickets bear numbers that are multiples of 5 and 6 ..
How likely is it that the store owner will make at least $7,000 if she implements your suggestion?
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
Normal adult Mean Temperature is 98.2 and standard deviant is 0.62 with normal distribution. If 16 people are randomly selected determine the probability that their mean body temp is below 98.5 degrees.
Jim and Mike go to a coffee shop during their lunch break and toss a coin to see who will pay. The probability that Mike will pay three days in a row is 0.125.
Your task is to interview a representative sample of attendees for the large concert venue where you work. The new season includes 200 live concerts featuring all types of musicians and musical groups.
Let C be the event that a diner gets the correct meal and let N be the event that a diner gets an incorrect meal. Find the probability that:
Find the critical value and test statistic value follows normal distribution.
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