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A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes. The chemistry of the new anesthetic is such that the effective time should be normally distributed with the same standard deviation, but a lower mean effective time. If it is lower, the company will market the new anesthetic; otherwise they will continue to produce the older one. A sample size of 36 results in a sample mean of 7.1. A hypothesis test will be done to help make the decision.
Using a Z test, the value of the test statistic will be?
The p-value of the test is?
Will the null hypothesis be rejected at the .10 significance level?
If the sample mean was 7.0, would the Ho be rejected at the .05 level?
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
Determine the distribution of X? Determine its parameters?
Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?
Pick a random sample of 50 homes from the enclosed 90 cases. Double the asking price and selling price and use this data to develop three predictive models:
Find the probability that exactly 15 flights arrive on time.
In this forum post provide your results also elucidate what they mean in context of your favorite channel. To find 95 percent confidence interval for given data.
The χ 2 statistic from a contingency table with 6 rows and five columns will have:
She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
Interpret the interaction graph in terms of what it shows about the three effects tested.
The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Use Chebyshev's theorem to answer the following questions.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
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