Calculus and Above

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Problem 16: A sample of 95 apple trees had an average number
Problem 16: A sample of 95 apple trees had an average number of 825 apples per tree. Construct an 80% confidence interval for the population mean number of apples on an apple tree. The population stan… read more
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The number of television sets coming off a production line
The number of television sets coming off a production line each day is known to have a standard deviation of 118.5 sets per day. The production manager tells you that the 90 % confidence interval for … read more
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I'm going to try to figure out how to snip it... The
I'm going to try to figure out how to snip it... The standard deviation of the daily demand for a product is an important factor for inventory control for the product. Suppose that a pharmacy wants to… read more
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A research company desires to know the mean consumption of
A research company desires to know the mean consumption of milk per week among males over age 45. A sample of 1842 males over age 45 was drawn and the mean milk consumption was 4.9 liters. Assume that… read more
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A fashion designer wants to know how many new dresses women
A fashion designer wants to know how many new dresses women buy each year. Assume a previous study found the variance to be 4. She thinks the mean is 7 dresses per year. What is the minimum sample siz… read more
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A recent study investigated the extent to which hypertension
A recent study investigated the extent to which hypertension is affected by alcohol consumption. Among other things, the study compared the rate of hypertension in nondrinkers to the rate in people th… read more
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Random and independent samples of recent prime time airings
Random and independent samples of recent prime time airings from each of two major networks have been considered. The first network aired a mean of commercials during prime time, with a standard devia… read more
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1. A random sample of 92 observers produced a mean X = 25.8
1. A random sample of 92 observers produced a mean X = 25.8 and a standard deviation s = 2.6. a) Find a 95% confidence interval for 11. b) Find the 90% confidence interval for Jl c) Find the 99% confi… read more
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FOR MR. WHITE b. Interpret the interval in terms of this application.
FOR MR. WHITE b. Interpret the interval in terms of this application. Choose the correct answer below: A. The water department can be 90% confident that the mean lead level of drinking water for all r… read more
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2. The mean diameter of a ball bearing produced by a certain
2. The mean diameter of a ball bearing produced by a certain manufacturer is 0.80 cm with a population standard deviation of 0.03 cm. A sample of 36 ball bearings is randomly selected from a productio… read more
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A sample of 120 U.S. households has a mean computer usage time
A sample of 120 U.S. households has a mean computer usage time of 19.2 hours per week with a sample standard deviation of 3.3 hours. Find a 99% confidence interval for the mean computer usage time of … read more
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"For Guru2009 only" 1. A random sample of fifty-five 200-meter
"For Guru2009 only" 1. A random sample of fifty-five 200-meter swims has a mean time of 3.98 minutes and a standard deviation of 0.06 minutes. Construct a 905 confidence interval for the population me… read more
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Chirag
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(1) For the following statement write the null hypothesis and
(1) For the following statement write the null hypothesis and the alternative hypothesis also label which one is the claim. A car manufacturer claims that their cars makes at least 35 miles per gallon… read more
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Chirag
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If you recall from Chapter 5, sample statistics (sample mean
If you recall from Chapter 5, sample statistics (sample mean and sample standard variation) are dependent or vary by sample. For example, the sample mean number of plain M&M candies in a 1.69 oz bag w… read more
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1. A pizza restaurant manager claims that eh average home delivery
1. A pizza restaurant manager claims that eh average home delivery time for their pizza is no more than 18 minutes. A random sample of 36 home delivery pizzas was collected. The sample means was found… read more
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Ryan
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TCO 6) Horse race time is found to be normally distributed
TCO 6) Horse race time is found to be normally distributed with a mean value of 10 minutes and a standard deviation of 2 minutes. Horses whose race time is in the top 5% will not be eligible to partic… read more
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Find the margin of error for the given values of c, s, and
Find the margin of error for the given values of c, s, and n. C=0.95, s=2.3, n=49 E=_________ (Round to three decimal places as needed) Construct the confidence interval for the population mean µ. C= … read more
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Sample of 45 home theatre systems has a mean price of $129.00
3. You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider? If the conv… read more
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