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Heights of ten year old boys (5th graders) follow an approximate normal distribution with mean u=55.5 inches and standard deviation σ=2.7 inches:
(a) According to this normal distribution, what proportion of 10 -year-old boys are between 4 ft 4.5 in and 5 ft 6.5 in tall (between 52.5 inches and 66.5 inches)?
(b) A parent says his 10 -year-old son is in the 98th percentile in height. How tall is this boy? Give answer in inches
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important? When might systematic sampling be biased?
A supermarket advertises that the waiting time spend by customers waiting in line at the cash register is uniform between 0 and 6 minutes.
(b) Reanalyze the data using R-mode analysis, that is, using the age distribution as the rows of the data matrix (Table 8.28). Can you determine the historical (time) behavior of the different age groups across race and sex?
Far separated sample means + differences of sample means are large compared to their internal (within) variability! Which of the following examples indicate group diff"s are "large"?
you are presenting the results of a research paper at a regional meeting. your study was focused on the relationship
The grades on a statistics midterm test are normally distributed with a mean of 78 and a standard deviation of 6
you want to compare years of schooling among american adults who describe their political veiwpoint as liberal moderate
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The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. The distribution of mean response times to fire calls follows a normal distribution with a mean of 12.8 minutes and a standard deviat..
At the airport entry sites, a computer is used to randomly decide whether a traveler's baggage should be opened for inspection. If the chance of being selected is 12%, can you model your chance of having your baggage opened with a Bernoulli model?..
Determine a 95% confidence interval for the population mean.
What is the average information per symbol, H(X) without any blocks being formed? What is the average information per symbol, H(X) when the blocks are formed?
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