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Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is μ = 45.7, and the standard deviation is σ = 12.5 years. Assuming that the distribution is normal, answer the following questions.
a. What proportion of licensed drivers are older than 50?
b. What proportion are younger than 50?
c. What is the median age?
d. What age separates the top 20% of drivers from the bottom 80%?
e. Young drivers are considered the most dangerous because they are less experienced. What proportion of drivers are between the ages of 18 and 25 - aka the "high risk" group?
Additionally, you know that there are 3 girls with age greater than 14 and 2 boys with age less than 12. What is the median age of all the students together?
For each exercise, determine the highest level of measurement that can be attributed to the data set described.
Determine the accumulated probability that you will have found someone with your birth month by the time you ask the fifth person.
Using the annual number of employees as weights, what is the weighted mean for annual utility plant investment per employee during this period?
The following statistics were calculated from pairs of observations where X represents the independent variable and Y represents the dependent variable.
Question - Step 2 of hypothesis testing involves reviewing the assumptions of the test you selected. Discuss the three assumptions of the t-test
What assumptions are you making to calculate these estimates? What do these assumptions mean in terms of fisher behavior and "catchahility"?
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 truthf..
Do the data suggest that the population mean weight of bags of ice is the same at these five locations? Use a = 0.001.
The physical representation of a steel strip-rolling mill is a damped-spring system [8]. The output thickness sensor is located a negligible distance from the output of the mill, and the objective is to keep the thickness as close to a reference v..
By using the age midpoints x and the percentages of nurses, do we have a valid probability distribution? Describe.
Suppose that students who scored much lower than the mean on their first statistics test were given special tutoring in the subject.
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