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An advertisement for Jewel, a supermarket chain in Chicago, claims that Jewel has had consistently lower prices than Dominic. As part of a survey conducted by an "independent market basket pricechecking company", the average weekly total, based on the prices of approximately 95 items, is given for two different supermarket chains recorded during 4 consecutive weeks in a particular month.
Week Jewel Dominic1 264.40 266.172 250.76 265.793 242.04 265.264 244.27 271.32
Is there a significant difference in the average prices for these two different supermarket chains? Test at α = 0.05
See if there is a difference in their means and variances.
It seems that simulation could handle any situation or study. But is that always true? Discuss instances in which a simulation would be important and useful, and then a situation in which a simulation would not be appropriate.
What measurements assesses the amount of variance of change in the dependent variable reflected by changes in the independent variable?
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
The instructor plans to draw a histogram of the 1,100 sample proportions. What will be the approximate mean for the 1,100 sample proportions?
If random sample of 9 loads is selected for weight check, determine probability that mean weight of those loads is more than 40.60 tons.
For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
At a 5% level of significance, is there evidence to conclude that the mean life is different from 375 hours?
Expireall Corporation is in finishing business. The following data took place during September: The standard cost card indicates that 2.0 feet are used in the production of each unit. The standard cost of each material is $4.50 per foot.
The article should include a margin of error and confidence interval. Discuss the subject matter in the article, and interpret the results and what the confidence interval and margin of error mean as they apply to the specific subject matter.
Suppose we conduct an ANOVA test of four treatment means and reject the null hypothesis. Construction of a confidence interval for the difference between the first and second sample mean revealed the interval to be 10 plus or minus 12. We conclude
What is the probability of selecting a value at random and discovering that it has a value of less than 395 pounds?
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