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The cost of a one-carat VS2 clarity, H color diamond from Diamond Source USE is $5,600. A midwestern jeweler makes calls to contacts in the diamond district of New York City to see whether the mean price of diamonds there is different from $5,600.
a. The test statistic is (2 decimals)
Answer:
b. The degrees of freedom are
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
Our nation's focus on crime has made a gradual shift away from drugs to what many perceive to be the major problem facing our criminal justice system today: juvenile crime,
Computation of Expectation, Variance and Covariance.Calculate the variances of Y1 and Y2.
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
If F(x, y) is the value of the joint distribution function of the two continuous random variables X and Y a (x, y),
A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. Is there evidence of an improvement on the final?
Create a real-world situation or problem that could be addressed using an independent- or related-samples t test. Create this situation or problem, that clearly identify the independent and dependent variables to study
1. distinguish between classification and tabulation of data. what are the types of classification of data?2. calculate
Suppose you decided to switch from a 99 to a 95 percent confidence interval. Without performing any calculations, will the interval increase, decrease, or stay the same? Which f the values in the formula will change?
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 150 was taken, and the mean amount spent was $225.
an important application of regression analysis in accounting is in the estimation of cost. by collecting data on
suppose you work for an automotive engineering group that is responsible for modeling the length of life of brake
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