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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.
Normal distribution has mean of 80 and standard deviation of 14. Find out the value above which 80 percent of values will occur.
Multiple comparison procedures are going to be done using the Bonferroni method with = 0.05. The value of t** is 2.4667. Which of the following is the appropriate conclusion from carrying out these multiple comparisons?
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
At 0.01 significance level can we conclude that mean fare has increased? Determine the p-value?
The singer has the following variety of songs, in no particular order: 7 relationship songs, 6 songs about people, 4 reflective songs, and 4 songs about places.
What is the probability that a randomly chosen eight-week old baby smiles between 2 and 18 seconds?
Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic, P-value, critical value(s), and state the final conclusion.
Confirm that these statements are accurate by finding the geometric mean rate of increase.
Find the probability using the Poisson distribution.
Answer the following three questions based on what you know about statistics now.
Create a 95% confidence interval for population mean. Is it sensible that population mean is 28 weeks? give explanation for your answer.
Solve the mean and standard deviation equations
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