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The standard IQ test has a mean of 100 and a standard deviation of 13. We want to be 98% certain that we are within 2 IQ points of the true mean. Determine the required sample size.
Construct a 95% confidence interval estimate for the population mean MPG of 2008 sedans under $20,000. (Round to one decimal place.)
Create a hypothesis test which will investigate the variances. Please label all steps for your test and show and label each step of the test procedure at a .1 level of significance. How do i create
Would you agree with this claim if the random sample showed an average of 23,500 km and a standard deviation of 3,900 km? Use 0.01 level of significance.
Mean life of electric bulbs produced by a company is 1500 hours with a standard deviation of 300 hours. Assuming that the life of bulbs follow Normal distribution, what is the probability that a ran
What proportion of children 10 to 15 years of age would be classified as hyperlipidemic assume that hyperlipidemia is defined as cholesterol level over 200?
In an effort to determine the most effective way to teach safety principles to a group of employees, four different methods were tried.
The average number of calories in a 1.5g chocolate bar is 225. Suppose that the distribution of calories is approximately normally distributed with σ=10. Determine the probability that a rando
If 300 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?
The number of cars sold annually by used car salespeople is normally distributed. a) Find the 95% confidence interval given a sample of 10 salespeople is taken has a mean of 75 and standard deviatio
Suppose a single pineapple is selected at random from last years crop. what is the approximate probability that it weighs more than 35 ounces show work.
An instructor believes that 20% or less of the students who finish a statistics course gat an "A" grade. A sample of 100 students was taken. 24 of the students in the sample received an "A". Test th
Past studies have shown that only 95% of booked passengers actually show up for the flight. What is the probability that exactly 99 booked passengers actually show up for the flight?
Find the critical value to test the claim that all ages have crash rates proportional to their driving rates. that all ages have crash rates proportional to their driving rates.
A sample of 121 provided a sample mean of 77.3. The population standard deviation is known to be 16.5.Using the critical value approach at 93.7% confidence, test the hypotheses.
Compute 99% confidence intervals for the average daily maximum temperature in August for each of the three years in which you collected data. How do they compare?
In order to estimate the average electric usage per month, a sample of 196 houses was selected, and their electric usage determined.
A man on trial is accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can b
Hypertensive experimental (n=100) is 14%, placebo (n=100) is 22%. Generate a 95% Confidence interval for difference in proportions of patients with hypertension between groups.
In Excel compute the sample average and the standard deviation for 2006. We want to determine whether there has been a significant decrease in the average number of jobs created.
The age distribution of drivers for the given categories is 18% for the under 26 group, 39% for the 26-45 group, 31% for the 45-65 group, and 12% for the group over 65. Find the rejection region to
Use the correct formula to find the probability that, out of 45 houses, exactly 4 of the houses will be burglarized. Show your calculations or explain how you found the probability
What would happen to the size and the sign of the correlation coefficient if we correlated these two variables? How can researchers work around this issue?
Cats live for 14 years on average, with a standard deviation of 2 years. A simple random sample of 78 recently deceased cats is selected, and the sample mean age at death of these cats is computed.
27% fall into both categories. What is the probability a randomly selected student commutes and does not participate in a student organization?