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Part A-
1. A company's customer support division want to test to see if that wait time for a consumer to talk to a representative is under 10 minutes. The manager proposes to test one case where a consumer was placed on hold. Is this a good testing strategy? If not what would be a better testing strategy? Could you form a Null Hypothesis or an Alternative Hypothesis? If yes, what would they be.
2. Using a specific example explain what a point estimation is and a confidence interval is.
Part B-
Question 1: The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with a mean of 266 days and standard deviation of 16 days.
Question 2: A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthfully.
Chandra has 5 liters of a 24% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 8 liters of 27% solution?
one study has reported that the sensitivity of the mammogram as a screening test for detecting breast cancer is 0.96
A final exam in Math 157 is normally distributed and has a mean of 75 with a standard deviation of 12. If 36 students are randomly selected, find the probability that the mean of their test scores is greater than 70.
What is the probability of obtaining a sample mean greater than M=105, for a random sample of n=9 people? For a random sample of n=36 people?
suppose iq scores were obtained from randomly selected siblings. for 20 such pairs of people the linear correlation
(a) Suppose we construct a 99% con?dence interval. What are we 99% con?dent about? (b) Which of the con?dence intervals is wider, 90% or 99%? (c) In computing a con?dence interval, when do you use the t-distribution and when do you use z, with normal..
a random sample of 6 music majors playing song s counted the number of mistakes each made. then these musicians played
What is an example of a directional alternate hypothesis? What is an example of a non-directional alternate hypothesis?
questionthe following artificial data record the length of stay in days spent on a psychiatric ward for 28
A 250-V shunt generator provides 5 kW to a certain load. The armature and ?eld resistances are respectively 0.5 and 200 Ω. Calculate the armature and ?eld currents, the electromotive force, and the torque required to move the generator, if it runs..
Determine whether the data set is a population or a sample
Suppose we compare two population means, μ 1 - μ 2 . In each case, indicate how μ 1 relates to μ 2 :
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