Calculus and Above

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A light bulb manufacturer wants to compare the mean
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 13 bulbs of model A s… read more
Sandhya_sharma
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It's the same as above but the numbers are different. Random
It's the same as above but the numbers are different … 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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Masters
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The lifetime of a certain brand of battery is known to have
The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 90 such batteries has a mean lifetime of 37.2 hours. Based on the sample… read more
Kofi
PhD in Statistics
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A psychologist wants to estimate the standard deviation of
second opinion] A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that the IQ scores follow a normal distribution. Her random sample of 24 IQ scores has a mea… read more
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Masters
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A psychologist wants to estimate the standard deviation of
A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that the IQ scores follow a normal distribution. Her random sample of 24 IQ scores has a mean of 96.5 and a … 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
Tom
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The lifetime of a certain brand of electric light bulb is
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 45 hours. Suppose that a random sample of 70 bulbs of this brand has a mean lifetime of 495 hours. Find … read more
Kimberley Wright
Masters
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Method 1: Use the Student's t distribution with d.f. = n −
Method 1: Use the Student's t distribution with d.f. = n − 1.Method 2: When n ≥ 30, use the sample standard deviation s as an estimate for σ, and then use the standard normal distribution.Consider a r… read more
Sandhya_sharma
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Could you also answer this question for me? Thank you again
Could you also answer this question for me? Thank you again for your help earlier! -----------------------------------------------------------------------------------------------Method 1: Use the Stud… read more
Keith Pelletier
Master's Degree
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Random and independent samples of 70 recent prime time
Random and independent samples of 70 recent prime time airings from each of two major networks have been considered. The first network aired a mean of 109.3 commercials during prime time, with a stand… read more
R.R. Jha
Bachelor's Degree
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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
GLENN GILONGOS
Master of Mathematics
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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
Chirag
Master's Degree
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Use the given information to find the P-value. Also, use a
Use the given information to find the P-value. Also, use a 0.05 significance level and state the conclusion about the null hypothesis (reject the null hypothesis or fail to reject the null hypothesis)… read more
Ryan
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Find the critical z value used to test a null hypothesis?
1. Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. Alpha = 0.09 for a right-tailed test. … read more
Sandhya_sharma
Master's Degree
Master's Degree
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The historical reports from two major networks showed that
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year. In order to find out whether they still air the… read more
Chirag
Master's Degree
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1. a) From the information given here, determine the 95% confidence
1. a) From the information given here, determine the 95% confidence interval estimate of the population mean. Xbar = 100 σ = 20 n = 25 2. b) Repeat part (a) with xbar = 200. c) Repeat part (a) with xb… read more
Chirag
Master's Degree
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Susan Athena Exercise 5 In random samples of 25 from
Susan Athena Exercise 5 In random samples of 25 from each of two normal populations, we found the following statistics: X1 = 524 S1 = 129 X2 = 469 S2 = 141 a. Estimate the difference between the two p… read more
SusanAthena
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