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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?
Standard deviation was increased to 40, determine the overall effect on their society? Would this change be a good thing?
Letting μ be the mean composite satisfaction rating for the gaming console, we find that the test should be H o : μ ≤ 42 versus H a : μ > 42
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
Based on past data, the Student Recreation Center knew that the proportion of students who prefer exercising outside over exercising in a gym was 0.734. To update their records, the SRC conducted a survey. Out of 95 students surveyed, 76 indicated..
We can think of this as the value of mew that maximizes f(y), the probability that our observed value of y occurs.
A survey of the number of calls received by a sample of Southern Phone Company subscribers last week revealed the following information.
Steps in hypothesis test procedure - conducting a hypothesis test for some general statistic, ? say.
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
Solve different inventory control problems using an appropriate OR method.
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
Find the range and the standard deviation of the times.
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