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The mean life of a battery used in a digital clock is 305 days. The lives of the battery follow normal distribution. The battery was recently modified to last longer. A sample of 20 of the modified batteries had a mean life of 311 days with a standard deviation of 12 days. The level of significance is .05. What would be your critical value or decision point?
A)1.725B)2.093C)1.729d)2.086
Did the modifications increase the life of the battery?
Time to help a stranger was investigated by a group of undergraduate psychology majors as a part of their Introduction to Research Methods course.
Under what circumstances should a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests?
An automobile manufacturer has a new model that they claim gets 27 miles per gallon. A consumer testing agency chooses 50 of these cars and finds that the sample mean is 25 miles per gallon and the sample standard deviation (s) is 3 miles per gall..
Over the past decade, there has been a strong positive correlation between teachers salaries and prescription drug cost.
Compute the value of the test statistic (to 2 decimals).
It is reported in USA Today that the average flight cost nationwide is $342.59. You have never paid close to that amount and you want to perform a hypothesis test that the true average is actually less than $342.59. What are the appropriate hypoth..
Which of the given signifies difference in two population proportions?
A test indicates the presence of a particular disease 90% of the time when the disease is present and the presence of the disease 2% of the time when the disease is not present.
Which of the following measures only the strength of a relationship?
As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?
At.02 significance level is it sensible to conclude that mean number of shoes sold at mall stores is larger than at outlet stores?
Using the information provided, determine the optimal number of clerks to have on duty each Satyrday to minimize the store's total expected cost.
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