Question 8 your answer is correct an experimenter

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quiz 10 70

Question 7   Your answer is CORRECT . Mars Inc. claims that they produce M&Ms with the following distributions : Brown 30 % Red 20 % Yellow 20 % Orange 10 % Green 10 % Blue 10 % How many M&Ms must be sampled to construct the 90 % confidence interval for the proportion of yellow M&Ms in that bag if we want a margin of error of ± .15 ?
a ) 23
b ) 20
c ) 19
d ) 11
e) 12
f) None of the above
Question 8   Your answer is CORRECT . An experimenter flips a coin 100 times and gets 51 heads . Find the 85 % confidence interval for the probability of flipping a head with this coin .
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Question 9   Your answer is CORRECT . Suppose that prior to conducting a coin - flipping experiment , we suspect that the coin is fair . How many times would we have to flip the coin in order to obtain a 96.5 % confidence interval of width of at most . 17 for the probability of flipping a head ?
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Question 10   Your answer is CORRECT . It has been observed that some persons who suffer acute heartburn are diagnosed with it again within one year of the first episode . This is due , in part , to damage from the first episode . In order to examine the percentage of the persons who suffer acute heartburn a second time , a random sample of 1100 people who suffered acute heartburn was collected . It was observed that 17 of them again suffered acute heartburn within one year . Select a 99 % confidence interval for the true proportion of those who suffer a second episode .
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Question 11   Your answer is CORRECT . When solving for the sample size required to estimate p to within a particular margin of error , under what circumstances do we use p ! = .5 ?
a) When p ! = . 4 and 1 - p ! = . 6
b) When the variance is equal to . 5 or when we desire a most conservative sample size .
c) When the computed value of p ! = . 5
d) When we have no prior information on the approximate value of p ! or p .
e) When the margin of error desired is less than or equal to . 5
f) None of the above
Question 12   Your answer is INCORRECT . Television viewers often express doubts about the validity of certain commercials . In an attempt to answer their critics , a large advertiser wants to estimate the true proportion of consumers who believe what is shown in commercials . Preliminary studies indicate that about 40 % of those surveyed believe what is shown in commercials . What is the minimum number of consumers that should be sampled by the advertiser to be 85 % confident that their estimate will fall within 1 % of the true population proportion ?
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Question 8 Your answer is CORRECT. An experimenter flips a coin 100 times and gets 51 heads. Find the 85% confidence interval for the probability of flipping a head with this coin. a) [0.430, 0.390] b) [0.430, 0.590] c) [0.480, 0.485] d) [0.330, 0.540]
12/8/13 4:53 PM Print Test e) [0.350, 0.590] f) None of the above Question 9 Your answer is CORRECT. Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to flip the coin in order to obtain a 96.5% confidence interval of width of at most .17 for the probability of flipping a head?
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Question 10 Your answer is CORRECT. It has been observed that some persons who suffer acute heartburn are diagnosed with it again within one year of the first episode. This is due, in part, to damage from the first episode. In order to examine the percentage of the persons who suffer acute heartburn a second time, a random sample of 1100 people who suffered acute heartburn was collected. It was observed that 17 of them again suffered acute heartburn within one year. Select a 99% confidence interval for the true proportion of those who suffer a second episode.
12/8/13 4:53 PM Print Test Page 6 of 8 f) None of the above

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