Sound it out: Phonics is an instructional method in which children are taught to connect sounds with letters or groups o

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Sound it out: Phonics is an instructionalmethod in which children are taught to connect sounds with lettersor groups of letters. A sample of 133
first-graders who were learning English were asked to identifyas many letter sounds as possible in a period of one minute. Theaverage number of letter sounds identified was 34.21
with a standard deviation of 23.33
A 99.9%confidence interval for the mean number of letter soundsidentified in one minute is
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11. A sample of sizen=41 has sample meanX =58 and samplestandard deviation s=9.4
a) Construct a 95%confidence interval for the population meanu
. Enter the values for the lower and upper limits and the meanto graph. Round the answers to one decimal place.
.20. Big chickens: The weights of broilers(commercially raised chickens) are approximately normallydistributed with mean1367grams and standard deviation184 grams. Usethe TI-84 Plus calculator to answer the following.
(a) What proportion of broilers weigh between1201 and1305grams?
(b) What is the probability that a randomly selected broilerweighs more than 1511grams?
(c) Is it unusual for a broiler to weigh more than1800grams?
Round the answers to at least four decimal places.
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. Watch your cholesterol: The mean serumcholesterol level for U.S. adults was 198with a 39.3standarddeviation of (the units are milligrams per deciliter). A simplerandom sample of 106
adults is chosen. Use the TI-84 calculator. Round the answers tofour decimal places.
B The probability that the sample mean cholesterol level isbetween 186and 192is