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The mean number of words per minute (WPM) read by sixth graders is 88 with a...
The mean number of words per minute (WPM) typed by a speed typist is 136136 with...
The mean number of words per minute (WPM) typed by a speed typist is 136136 with a standard deviation of 1111 WPM. What is the probability that the sample mean would differ from the population mean by greater than 11 WPM if 7676 speed typists are randomly selected? Round your answer to four decimal places. PLEASE EXPLAIN IN CALCULATOR SPECIFALLY TI 83 PLUS
The mean number of words per minute (WPM) typed by a speed typist is 79 with...
The mean number of words per minute (WPM) typed by a speed typist is 79 with a variance of 225. What is the probability that the sample mean would differ from the population mean by less than 2.7 WPM if 97 speed typists are randomly selected? Round your answer to four decimal places.
The reading speed of second grade students is approximately normal, with a mean of 90 words...
The reading speed of second grade students is approximately normal, with a mean of 90 words per minute (wpm) and a standard deviation of 10 wpm. Complete parts (a) through (f). (a) What is the probability a randomly selected student will read more than 95 words per minute? The probability is (Round to four decimal places as needed.) (b) What is the probability that a random sample of 11 second grade students results in a mean reading rate of more...
The reading speed of second grade students in a large city is approximately normal, with a...
The reading speed of second grade students in a large city is approximately normal, with a mean of 92 words per minute (wpm) and a standard deviation of 10 wpm. Complete parts (a) through (f). (a) What is the probability a randomly selected student in the city will read more than 98 words per minute? The probability is (Round to four decimal places as needed.)
the reading speed of second grade students in a large city is approximately normal, with the...
the reading speed of second grade students in a large city is
approximately normal, with the mean of 89 words per minute (wpm)
and a standard deviation of 10 wpm
a.) what is the probability a randomly selected student in the
city will read more than 94 words per minute?
b.) what is the probability that a random sample of 11 second
grade students from the city results in a mean reading rate of more
than 94 words per minute?...
An educational psychologist wishes to know the mean number of words a third grader can read...
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an estimate at the 99 % level of confidence. For a sample of 1584 third graders, the mean words per minute read was 35.7 . Assume a population standard deviation of 3.3 . Construct the confidence interval for the mean number of words a third grader can read per minute. Round your answers to one decimal place.
An educational psychologist wishes to know the mean number of words a third grader can read...
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an estimate at the 98% level of confidence. For a sample of 1116 third graders, the mean words per minute read was 28.1. Assume a population standard deviation of 4.2. Construct the confidence interval for the mean number of words a third grader can read per minute. Round your answers to one decimal place.
Suppose that the reading speed of sixth-grade students is normally distributed with mean speed of 125...
Suppose that the reading speed of sixth-grade students is normally distributed with mean speed of 125 words per minute and standard deviation 24 words per minute. What is the probability that a randomly selected sixth grader reads more than 160 words per minute?
An educational psychologist wishes to know the mean number of words a third grader can read...
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to ensure that the estimate has an error of at most 0.22 words per minute. A previous study found that the mean was 294 words per minute. Assuming that the standard deviation is 3.9. what is the minimum number of third graders that must be included in a sample to construct the 80% confidence interval Round your answer up to...
An educational psychologist wishes to know the mean number of words a third grader can read...
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to ensure that the estimate has an error of at most 0.2 words per minute. A previous study found that the mean was 26.3 words per minute. Assuming that the standard deviation is 4.3, what is the minimum number of third graders that must be included in a sample to construct the 85% confidence interval? Round your answer up to...
The reading speed of second grade students is approximately normal, with a mean of 90 words per minute (wpm) and a standard deviation of 10 wpm. Complete parts (a) through (f). (a) What is the probability a randomly selected student will read more than 95 words per minute? The probability is (Round to four decimal places as needed.) (b) What is the probability that a random sample of 11 second grade students results in a mean reading rate of more...
The reading speed of second grade students in a large city is approximately normal, with a mean of 92 words per minute (wpm) and a standard deviation of 10 wpm. Complete parts (a) through (f). (a) What is the probability a randomly selected student in the city will read more than 98 words per minute? The probability is (Round to four decimal places as needed.)
the reading speed of second grade students in a large city is
approximately normal, with the mean of 89 words per minute (wpm)
and a standard deviation of 10 wpm
a.) what is the probability a randomly selected student in the
city will read more than 94 words per minute?
b.) what is the probability that a random sample of 11 second
grade students from the city results in a mean reading rate of more
than 94 words per minute?...
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to ensure that the estimate has an error of at most 0.22 words per minute. A previous study found that the mean was 294 words per minute. Assuming that the standard deviation is 3.9. what is the minimum number of third graders that must be included in a sample to construct the 80% confidence interval Round your answer up to...
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to ensure that the estimate has an error of at most 0.2 words per minute. A previous study found that the mean was 26.3 words per minute. Assuming that the standard deviation is 4.3, what is the minimum number of third graders that must be included in a sample to construct the 85% confidence interval? Round your answer up to...
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