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Chapter 8: Q 3. (page 506)
Going to the prom Tonya wants to estimate the proportion of seniors in her school who plan to attend the prom. She interviews an SRS of of the seniors in her school and finds that plan to go to the prom.
The answer is.
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It鈥檚 about ME Explain how each of the following would affect the margin of error of a confidence interval, if all other things remained the same.
a. Increasing the confidence level
b. Quadrupling the sample size
Oranges A home gardener likes to grow various kinds of citrus fruit. One of his
mandarin orange trees produces oranges whose circumferences follow a Normal
distribution with mean cm and standard deviation cm.
a. What is the probability that a randomly selected orange from this tree has a
circumference greater than cm?
b. What is the probability that a random sample of oranges from this tree has a mean circumference greater than cm?
More online sales Refer to Exercise 35. Calculate and interpret the standard error of for these data.
Check them all Determine if the conditions are met for constructing a confidence interval for the population mean in each of the following settings.
a. How much time do students at your school spend on the Internet? You collect data from the members of your AP Statistics class and calculate the mean amount of time that these students spent on the Internet yesterday.
b. Is the real-estate market heating up? To estimate the mean sales price, a realtor in a large city randomly selected home sales from the previous months in her city. These sales prices are displayed in the boxplot.
BlinkWhen two lights close together blink alternately, we 鈥渟ee鈥� one light moving back and forth if the time between blinks is short. What is the longest interval of time between blinks that preserves the illusion of motion? Ask subjects to turn a knob that slows the blinking until they 鈥渟ee鈥� two lights rather than one light moving. A report gives the results in the form 鈥渕ean plus or minus the standard error of the mean.鈥� Data for subjects are summarized as (in milliseconds).
a. Find the sample standard deviation for these measurements.
b. A hasty reader believes that the interval given in the report is a confidence interval for the population mean. Find the actual confidence level for the given interval.
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