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You run an advertising company and need to know how much time per day an average person spends listening to the radio. You want to be within 4 minutes of the population mean listening time w
Which statistical analysis technique should be used? What is the null hypothesis? Can an analysis be performed? Why or why not?
Which statistical analysis technique should be used? What is the null hypothesis? Can the market researcher get an answer? Why or why not?
Let X denote a geometric random variable with parameter p. For s >=0, compute E[e^(-sX)]. For what other values of s is your calculation valid?
You and your opponent both roll a fair die. If you both roll the same number, the game is repeated otherwise whoever rolls the larger number wins. Let N be the number of times the two dice have to
Using D to denote the event that the selected household has a dog and C to denote the event that the selected household has a cat, symbolically denote the following events and identify the number of
The supplier has determined that the standard deviation of its production process is 0.05 cm. The process is normally distributed. Each of the following questions is independent except question e wh
On a normal distribution with a mean of 500 and a standard deviation of 97, what percentage of cases will fall between 470 and 550?
Which of these variables are categorical and which are quantitative? Give the units for the quantitative variables and the categories for the categorical variables. What are the individuals in the r
A box contains n marbles each of which is labeled (by engraving) by one of the integers 1, 2, . . . , n. Two of the marbles are drawn in succession without replacement. Let X and Y denote the intege
A survey of adults found that 55% have used a multivitamin in the past 12 months. You randomly select 50 adults and ask them if they have used a multivitamin in the past 12 months. If this is a bin
Given a pair of fair dice (each face is equally likely to show upward). What is the expectation of this random variable (the summation of the two numbers showing upward)?
A study investigated how the size of a person's dwelling was related to their ownership of motor vehicles. They found that dwelling size and number of vehicles owned was strongly correlated and conc
For each of the variables below state what level of measurement it is and is it discrete or continous.
Please Identify the two variables and then state which is independent and which is the dependent variables in the following:
A group of one hundred students are asked for their High School and college GPA's what is the variable and the level of measurement?
A brand of television has a lifetime that is normally distributed with a mean of 7 years and a standard deviation of 2.5 years. What is the probability that a randomly chosen tv will last more than
A supplier of wire cables has determined that the strength of the cables has a normal distribution with mean ? = 2000 pounds and standard deviation ? = 60 pounds. The manager of a co
The blood groups of 200 people is distributed as follows: 50 have type A blood, 65 have B blood type, 70 have O blood type and 15 have type AB blood. If a person from this group is selected at rando
Suppose that the correlation r between two quantitative variables was found to be r = 0. This means that:
After a military campaign sample of 59 soldiers were examined, it was determined that 32 of them suffered from lifetime post-traumatic stress disorder (PTSD). What type of confidence interval should
An automobile mileage study tested the following hypotheses. For o~ = 3 and a .02 level of significance, what sample size would be recommended if the researcher wants 80% chance of detecting that u i
Sparr Investment, Inc., specializes in tax-deferred investment opportunities for its clients. Recently Sparr offered a payroll deduction investment program for the employees of a particular company.
The shape of the distribution of the time required to get an oil change at a 15 minute facility is unknown. However, records indicate that the mean time is 16.1 minutes and the standard deviation
There are twelve zodiac signs and each person is born under exactly one sign. Suppose that each sign is equally likely to occur.