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1.What is the proportion of customers who buy service plans when they buy a computer? To find out, you surveyed 166 customers and found that 53 purchased the service plan. What is the upper boundary of 90% confidence interval for the population proportion? Use Excel and round your answer to two decimal places. Give the answer as a decimal percent (that is, for 10%, give 0.1).
2. Using Excel, find the right-tail probability corresponding to the following t value. Round the answer to 4 decimal places. t = 1.456. There are 7 degrees of freedom.
3. Consider the following test performed with the level of significance 0.05: H0:u>=100 Ha:u<100 A random sample of size 31 is obtained from a normally distributed population. The population standard deviation is equal to 39.5. The sample mean happened to be 95.4. For this hypothesis test, what will be the critical value (the relevant z-alpha)?
Hint: Watch the sign - the critical value can be negative or positive. Round the answer to three decimal places.
Is there any evidence to suggest that the mean amount of protein is different in these two products? Use a = 0.01 and assume normality.
A company receives shipments of a component used in the manufacture of a component for a high-end acoustic speaker system. When the components arrive, the company selects a random sample from the shipment and subjects the selected components to a..
Complete computer output for all statistics for all four variables - Calculate the sample mean and sample standard deviation.
a simple random sample of 40 salaries of ncaa football coaches has a mean of 415953 and a standard deviation of
The following data represent the results from an independent-measures study comparing three treatments.
Let X1,..., Xn be a random sample from the uniform distribution f(x) = 1/2, 0 ≤ x ≤ 2. Find the probability density function for the range R = (X(n) - X(1)).
A manufacturer claims that the life span of its tires is 51,000 miles. Assuming the manufacturer's claim is correct, what is the probability the mean of the sample is 50767 miles or less?
In a large group of Americans in 2001-2002, the probability of visiting a doctor's office in the past 12 months was 0.8.
The fill volume of cans produced by a certain machine is normally distributed with mean 12 oz and standard deviation .03 oz. [4] a. What proportion of cans contain less than 12 oz?
A sample of 25 concession stand purchases show a mean purchase of $5.29 with a standard deviation of $3.02. However, a later showing of the same movie, a sample of 25 purchases where the mean was $5.12 with a standard deviation of $2.14.
At a certain store the number of arrivals per minute during the day has the following distribution: Find the mean and standard deviation of the distribution
Solve the following questions involving fundamental operations on polynomials. Solve the following problems involving applications of polynomials.
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