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The average lifetime of a light bulb is 3,000 hours with a standard deviation of 696 hours. A simple random sample of 36 bulbs is taken.
a. What are the expected value, standard deviation, and shape of the sampling distribution of ?
b. What is the random variable in this problem? Define it in words.
c. What is the probability that the average life in the sample will be between 2,670.56 and 2,809.76 hours?
d. What is the probability that the average life in the sample will be greater than 3,219.24 hours?
e. What is the probability that the average life in the sample will be less than 3,180.96 hours?
medical tests were conducted to learn about drug-resistant tuberculosis. of 142 cases testedin new jersey 9 were found
To test the difference between two means using two mean z test.
Select a legitimate sampling strategy and collect at least 30 data points using your created question or topic. Discuss the sampling strategy in sufficient detail so that someone else could repeat your data collection without any difficulties or q..
Carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
Standard deviation of 0.02 ounce. You can permit cup to overfill 4% of the time. What amount must you set as mean amount of coffee to be dispensed?
Make a conclusion about the hypotheses bases on your result( not why, should be it means) Required minimum-1 page
consider an experiment in which our sample space is s1234567.also e1124 e223456 e37. describe the outcomes in each one
The manager of a paint supply store wants to determine whether the mean amount of paint conatined in 1- gallon cans purchased from a nationally known manufacturer is actually 1 gallon.
Five have a 3/10,000 chance for failure. Four have a 4/10,000 chance for failure. One componet has a 1/100 chance for failur. What is the overall reliability of the product?
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles.
Sample mean of 190.7 days and the population standard deviation of 54.2 days. Estimate the true mean population of the growing season with a 95% confidence.
If the researcher wants to test if the blood pressure measurements after the procedure are different from the blood pressure measurements before the procedure, what will the null and alternative hypotheses be? Treat the differences as (blood press..
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