Classify the following samples: a.) Volunteers: Covenient Sample b.) Police Info
ID: 3295806 • Letter: C
Question
Classify the following samples: a.) Volunteers: Covenient Sample b.) Police Informants: c) 50% students, 25% housewives, 25% retired people: Quota Sample A biologist wants to estimate the mean diameter of a cell that is known to have a standard deviation of 1 micron. How large a sample should be in order to say with 95% confidence that the mean estimation will not fluctuate from the population diameter by more than 0.1 microns. If the intelligence quotients (IQs) of a sample of 400 Texas TEch students has a sample mean of 115 and a standard deviation of 10.1, construct the 99% confidence interval for the population mean Determine how large a sample should be for a 95% confidence interval corresponding to a rate that is off the population value no more than 3% n = 1067.1 A sample of 400 TTU students was selected for an IQ test. The null hypothesis H0 is that the average IQ is 100, whereas the alternative Ha means IQ does not equal 100 The sample IQ mean resulted in 98.3 with standard deviation 16. Can we reject H0? yes, H0 can be rejected Find the regression line equation and r squared value between X and Y using the following data {(10,9), (9,8), (11,13), (5,7), (12,20)}. Does the value of the r squared sow the regression line is a good fit? y = -2.8288 + 1.5137x = 0.591, does not show a good fit If the probability for snot tomorrow is 0.45, what is the probability of no snow tomorrow? P(no snow) = 1-0.45 = 055 You are rolling a pair of fair dice: a.) What is the probability of getting a 7? 1/6 b.) What is the probability of getting an 11? 2/36 or 1/18 c.) What is the probability of getting 7 or 11? 6/36 + 2/36 = 8/36Explanation / Answer
7)
n = (z* s/e)^2
for 95 % , z = 1.96 , s = 1 , e = 0.1
hence
n = (1.96* 1/0.1)^2 =384.16
hence n = 385
8) Xbar= 115,s=10.1
t-critical = 2.576
confidence interval
(Xbar - t *s/sqrt(n)), (Xbar + t *s/sqrt(n))
(115 - 2.576 * 10.1/sqrt(400)),(115 +2.576 * 10.1/sqrt(400))
= ( 113.6991,116.30088)
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