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In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied. Assume that the distribution of the responses can be approximated by a normal distribution with a mean of 7 and a std deviation of 1.
a. What is the probability that an individual customer gives a rate of at least 8?
b. In a random sample of 10, what is the probability that the average rating is at least 8?
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.) Use the five steps of hypothesis testing and explain your findings.
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the ..
A four-year financial project is forecast to have net cash inflows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project
If you have a statistical package that computes binomial probabilities, find the probability that at least five funds outperform the market in all 10 years.
Randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values listed below have a mean of 12.19 ounces and a standard deviation of 0.11 ounces. Use a 0.05 significance level to test the claim that cans of coke hav..
Determine the probability that the project will be completed in 90 days or less.
The model that result is: y= 0.6 + 1.2x, where the dependent variable is the amount of sales, in thousands of dollars, realized during the week and the independent variable is the amount spent on newspaper advertising, in hundreds of dollars, duri..
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
The random variable x has a normal distribution with mean=30 and standard deviation=30, find the probability that x assumes a value more than two standard deviations from its mean. more than three standard deviations from the mean.
Find the probability of getting a head and rolling a six
Explain finding value of test statistic for the given data also interpret the result. Can Mr. Ratter compute which the mean weight of the bags is less than 50 pounds.
Compute the number of French fries that would have to be sampled and measured to be 98% sure of being within 0.4 cm of the true mean.
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