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The average age of statistics students nationwide is 22. The standard deviation is 2.5 years. Assume the age is a normally distributed variable.Find the probability that one student selected at random is older than 23.
A mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. what is the standard error for the sample mean?
Show the complete ANOVA table for this test including the test statistic. The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude?
Assume the probability that a person has the desease is 0.08 for all people, independently of each other. Compute the total expected number of tests necessary.
Roll a balanced 8-sided dice and a balanced 6 sided die and add the spots on the up-faces. Call the sum X. What is the probability distribution of the random variable X.
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
Conditional and compound probabilities.The table below gives the distribution of blood types by gender in a group of 1000 individuals.
A study of the time spent shopping in a supermar- ket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be:
Determine the probability of choosing at random license plate which ends in the even number?
The Executive Camera Company provides full expenses for its sales force. When attempting to budget automobile expenses for its employees, the financial department uses mileage figures to estimate gas, tire, and repair expenses.
To test the given claim using Single Proportion Z test.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
After polling every 8 th graduate, a major university estimated annual salary of its alumni to be $103,000. What sampling technique was used?
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