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What type (and level) of data must you collect to conduct a t-test? Why? What are examples of variables with which we would use a t-test?
Population blood pressure (BP) of patients is normally distributed, with a mean of 127, and standard deviation of 8. A random sample of 49 patients in the hospital found an average BP of 125.
Suggest one psychological research question that could be answered by each of the following types of statistical test:
A researcher wants to create a 99% confidence interval for the population mean. He has a sample of n=120, an x-bar of $340, and a sample standard deviation of $122. What is the margin of error?
The quality control manager at a lightbulb factory needs to determine whether the mean life of a large shipment of lightbulbs is equal to the specified value of 375 hours.
Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 70,000 miles. What is the probability of having a tire that lasts more than 80,000 miles.
Probability histogran curve of percentage of (P)z
She was concerned that the test she wished to perform might have unacceptable large possibilities of Type II error, ß. Which of the following would solve this problem?
Find the probability that it has a defective bulb or defective battery, a good bulb or good battery,a good bulb and good battery.
A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error?
the alphacor company experiences some type of failure on its computer network on average once every 4 hours. assume
Using the 0.05 significance level what should we conclude about the theory that 24hrs. is a natural cycle? a) use hypothesis steps b) sketch distribution c) explain to someone who never took this course.
The DPMO for process is 860. Find the approximate Six Sigma level of the process?
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