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The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow the normal distribution. The battery was recently modified with the objective of making it last longer. A sample of 20 of the modified batteries had a mean life of 311 days with a standard deviation of 12 days. Did the modification increase the mean life of the battery?
a. State the null hypothesis and the alternate hypothesis.
b. Show the decision rule graphically. Use the .05 significance level.
c. Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.
Find the margin of error for the 95% confidence interval used to estimate the population proportion.
In a normal frequency distribution, 32% of the cases:
Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
At a large commercial bakery, one of the measures familiar with evaluate employees is the number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and bro..
To test productivity quickly, he has his shift foremen record number of defective T-shirts made in randomly sampled week. Critical Value: t =Test Statistic (Show procedure.): t =?
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Develop a 95% confidence interval of the difference between the daily population means for the two airports.
Conclude whether the given conditions justify using the methods of this section when testing a claim about a population mean µ.
Using quadratic regression model find the estimated number of planes.
What is the intercept for the logistic regression equation and What is a 95% confidence interval for the odds ratio
Set up null hypothesis for associated F test.
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
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