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1. What is pooled variance and why is it important?
2. Explain what interval data is and give an example:
3. Write the formula for a problem that has 2 sample populations greater than 30 and the standard deviations are known and equal:
4. Write the formula for pooled variance.
5. Please analyze the following data using the T-test for Unpaired data:
A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent CAT scores and found the mean score for girls to be xbar1 = 25 and the mean score for boys to be xbar2 = 26. The standard deviation for the girls is s1 = 2.2 and for the boys the standard deviation is s2 = 3.4. Is the school district correct in assuming the girls are equal in performance to boys. They are 95% sure their assumption is correct.
A researcher has been hired by a pizzeria to determine which type of crust customers prefer. The restaurant offers three types of crust: hand tossed, thick, and thin.
How would you use the concept of probabilities to apply to profiles for hiring more satisfied individuals?
A hypothesis test is to be used to help determine if there is a difference between the proportion of 2 year college students and private university students that work at least 20 hours per week.
find probabilty that the average of those counts is more than 83.0 mosquitoes per square meter. Assume the variable is normally distributed.
Consider that you are a line manager in your current Corporation. There is a 0.50 probability that you will be promoted this year. There is a 0.65 probability that you will get a promotion or a raise. The probability of getting a promotion and a r..
The time (in hours) until failure of a transistor is a random variable X which is exponentially distributed with mean = 50. It is observed that after 40 hours the transistor is still working. Find the conditional probability that X > 65.
Perform a significance test to see if there is a relation between mortality and duration of employment in the group hired AFTER 1945 and report a p-value.
Discuss the limitation of the expected value approach to assessing the risks of taking on the franchise. What other factors should be considered by Ariba Ltd?
You manufacture and sell an iron rod whose electrical conductivity is supposed to be 10.1. You plan to make 6 measurements of the conductivity of a rod you plan to sell.
Find the sample space for the number of outcomes (you don't need to list the possible outcomes, just how many possible outcomes there are).
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
You will investigate four different scenarios of population growth also decline in this town. Graph the model as well as investigate it by four different growth models.
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