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The average 1- ounce chocolate chip cookie comprises 110 calories. Random sample of 15 different brands of 1- ounce chocolate chip cookies resulted in following calorie amounts. At α=0.01 level, is there sufficient evidence that average calorie content is greater than 110 calories. 100 125 150 160 185 125 155 145 160 100 150 140 135 120 110.
Discuss why sampling is essential to many research designs, and why, if done correctly may be more accurate than attempting census measurement.
An experiment is designed to test the potency of a drug on 20 rats. Previous animal studies have shown that 10-mg dose of the drug is lethal 5% of the time within the first 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours..
Give an example for each of the following distributions, binomial, hypergeometric, and Poisson. Explain the differences and different characteristics.
How many measurements should be made in order to be 90% certain that the maximum error of estimation will not exceed 2.0 seconds?
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
Use a .05 significance level to test claims that quarters manufactured with the new equipment have weights with a standard deviation less than .061
The average age of the women was 45.582 with a standard deviation of 5.143. He uses this information to calculate a 95% confidence interval for the differnce in means, (-11.41, -5.422). The best interpretation of this interval is which of the foll..
Use a 1% level of significance to test the claim that there are more calls during the night than in the day.
Describe the difference between sample and a sampling distribution. Your reply must be in complete sentences and you may use sketches to help you.
If you select a random sample of 16 cups and are willing to have an α = 0.05 risk of committing a Type I error, compute the probability of a Type II error (β) if the population mean amount dispensed is actually:
Suppose that 20 minutes are selected independently and weighted. Let Y equal the number of these mints that weigh less than 30 grams.
Examine the two standard deviations. What do these indicate about the range of benefits enjoyed by the two groups?
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