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Two types of batteries x and y tested for their length life and the following result abtained: battery x :sample size 10,mean hour 1000,variance hour 100 and battery y: sample size 12,mean hour 1020,variance hour 121. can you conclude that two types of batteries are having the same mean life?
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
Test the hypothesis that there is no difference in the mean scores of Exam 1 and Exam 2 against the alternative that the average is greater for the second exam.
For following data, find out whether or not right-hemisphere damage results in significantly decreased performance on spatial skills task.
How many Standard Errors is $850 below $900? If we want to test the null hypothesis that the hotline does not reduce costs, what would be the conclusion based on this data?
Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
Group 2 data [ 141, 139, 172, 131, 150, 125. Assume normal distribution, with equal variance in the two groups and conclusion for a=0.05.
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours. A random sample of four students was taken in order to estimate the mean study time for the population of all students.
The following data shows the service ratings for eight ramdomly selected small ships, eight randomly selected large ships. All ships are rated on a 100-point scale, with higher valuse indicated better service (traveler Feb 2003)
A TV spot in the Channel 22 early news costs $1500. The average quarter hour Adult 25-54 audience is 15,000. What is the CPM?
The quality-control inspector checks 200 pieces in a certain operation. The piece is either good or defective. The record for nine hours.
The average price of a home is reported to be $203,190. Use this price as the population mean, and assume the population standard deviation is 43,890.
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