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A researcher believes that the retail price of new identical automobiles differs between an Urban location and a Suburban location. A random sample of 25 cars sold at Urban locations gave a sample mean of $16,496 and a sample standard deviation of $1,981. A random sample of 20 sales at Suburban locations found a sample mean of $17, 236 and a sample standard deviation of $1,974. Test the researcher's belief at a 5% level of significance. What is your conclusion
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on very accurate scale. The results in grams were 3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477 (a)Construct a 90% confidence interval for the tr..
which of the following best describes what the 95 confidence means in a 95 confidence interval for mu of 10 20?a there
the mean annual salary for chauffeurs is 21000. a random sample of size 45 is drawn from this population. assume that
Graph the p.d.f and show that the probability of the part failing in the first 200 weeks is 1/8
you wish to conduct an anova one wayomnibus in your capstone project. in order to insure you have enough power to
standard deviation= 2.5 ounces. Which of the following is true about the sampling distribution of the sample mean if a sample of size 15 is selected?
Sampling Distribution for mean
Doctors nationally believe that 68% of a certain type of operation are successful. In a particular hospital 47 of these operations were observed and 37 of them were successful. At a = 0.05 is this hospital's success rate different from the nationa..
Using the 50%-34%-14% figures, approximately what percentage of people have a score a) above 40 b) above 45 c) above 30 d) below 45 g) below 30.
Jerry however is unsure the 0.6 probability of a favorable marketing research study is correct. How sensitive is Jerry's decision to this probability value ? How far can this probability value deviate from 0.6 without causing Jerry to change his d..
At a probability of type 1 error of 0.05, test the claim that the assistant professors earn more than $42000 per year. the standard deviation of the population is $5230.
The mean age of a sample of 60 students from a class was found out to be 25.3 years. The variance in population age was 16 years.
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