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A random sample of 46 observations was selected from a normally distributed population. The sample mean was xbar=81, and the sample variance was s2=35.0. Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 7 at the 0.05 level of significance? Use the p-value method.
Assume that a patient is believed to have one of two diseases, denoted by D1 and D2 with P(D1)=0.40 and P(D2)=0.60 and that medical research has determined the probability associated with each symptom that may accompany the diseases.
The monthly income of residents of Dayton is normally distributed with a mean of $3000 and a standard deviation of $500.
Students that studied for more than one hour received a c+ or above on the final. Use a .05 significance level to test the professor's claim.
A prof. can't decide how to vote on a tuition increase for the students at her univ. The incrase is supposed to pay for new student parking and there appears to be mixed feelings. The prof.
Assume the population standard deviation is 7.1 mpg. State the correct null and alternative hypotheses that the company wishes to test. Calculate the test statistic that would be used for conducting the desired test.
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
If a Normal model is useful for describing slalom times, approximately how many of the other 35 skiers finishing the event would you expect skied the slalom faster than Jean-Baptiste?
When there is more than two predictors, one can no longer graph the tted surface in the usual way. How then does one make sense of a surface in more than three dimensions?
Calculate the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year. Identify the median age of the uninsured senior citizens
Create raw score predictions on criterion variable for persons with Z scores on predictor value of -2,-1,0,+1,+2.
The number of breakdowns is dependent on the shift, because the test value 11.649 is less than the critical value of 12.592.
If hypothesis test for single population variance is to be conducted by using significance level of to 0.10, a sample size of n = 16, and test is a one-tailed upper-tail test, the critical value is?
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