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We want to estimate the population mean within 5, with a 99 percent level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
Finding the probability value for the given data using normal approximation
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Not take SRS of 25 students who took test. What are the mean and standard deviation of sample mean score xbar of these 25 students?
Findout the probability value for normal distribution. Illustrate the weight of football players is normally distributed with a mean of 200 pounds also a standard deviation of 25 pounds.
Suppose a survey item asks someone if something is very important, somewhat important, not very important, or unimportant. This is an example of what level of measurement?
Utilizing the 5% level of significance as there was a significant change in cholesterol level. Their total cholesterol levels before also after the diet.
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
What is sampling error? Could value of sampling error be zero? If it were zero, what would this mean?
Change the frequencies to percentages - is there a group more likely to get high salaries.
Identify the independent and dependent variables, and Construct a nominal, ordinal, and interval level measure for each independent and dependent variable.
Determine the standard deviation of difference between Sarah's and Richard's scores?
If the population mean was $1047 in the previous year, does the evidence suggest that expenditure this year has significantly changed?
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