Question: Describe the sampling distribution of 1 2 for two
Describe the sampling distribution of 1 – 2 for two independent samples when σ1 and σ2 are known and either both sample sizes are large or both populations are normally distributed. What are the mean and standard deviation of this sampling distribution?
Answer to relevant QuestionsRefer to the information given in Exercise 10.18. Test at a 1% significance level if the two population means are different n1 = 55 1 = 90.740 s1 = 11.60 n2 = 50 2 = 86.30 s1 = 10.25 The standard recommendation for automobile oil changes is once every 3000 miles. A local mechanic is interested in determining whether people who drive more expensive cars are more likely to follow the recommendation. ...Quadro Corporation has two supermarket stores in a city. The company’s quality control department wanted to check if the customers are equally satisfied with the service provided at these two stores. A sample of 380 ...According to the information given in Exercise 10.25, a sample of 45 customers who drive luxury cars showed that their average distance driven between oil changes was 3187 miles with a sample standard deviation of 42.40 ...Explain when would you use the paired-samples procedure to make confidence intervals and test hypotheses.
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