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A manufacturer of headache medicine claims it is 70% effective within a few minutes. That is, out of every 100 users, 70 get relief quickly. A group of 12 patients are given the medicine. If the claim is true, what is the probability that 8 have relief in a few minutes?
a. 0.001b. 0.168c. 0.667d. 0.231e. None of the above
In looking at your business, when and why would you want to use a one-sample mean test (either z or t) or a two-sample t-test? Create a null and alternate hypothesis for one of these issues. How would you use the results?
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial.
What is the approximate probability that the combined weight of 25 items exceeds 445 ounces? What theorem is useful in answering this question?
Standard deviation of 424 and 155 respectively. at the .05 level of significance, test the claim that the new version has standard deviation equal to that of the past version.
When using SPSS to perform a 2 independent sample t-test, the P-Value was .136...with alpha set to .05. I have to decide to accept or reject the null hypothesis.
The 99% confidence interval using a t-distribution is ( ), ( ). Round to one decimal place as needed
Defective components in a unit? further what is the probability in a unit(i)less then 3 components are defective? (ii)exactly 3 components are defective?
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
Random variable with mean of 10 and standard deviation of 2.4. Over the course of the next year, what is the probability that you average more than 11 games a month?
Given the variances of the two samples below, find the test value and the degrees of freedom that should be used in an F test.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
What is the importance of pretesting questions and instruments? What are risks of not doing this? Provide an example
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