Chapter 2: Q. 1.3 (page 114)
3. What percent of young women have heights between 62 and 72 inches? Show your work.
Short Answer
The percentage young women have heights between 62 and 72 inches are
Chapter 2: Q. 1.3 (page 114)
3. What percent of young women have heights between 62 and 72 inches? Show your work.
The percentage young women have heights between 62 and 72 inches are
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Get started for freeNormal is only approximate: ACT scores Scores on the ACT test for the 2007 high school graduating class had mean and standard deviation . In all, students in this class took the test. Of these, had scores higher than and another had scores exactly 27. ACT scores are always whole numbers. The exactly Normal distribution can include any value, not just whole numbers. What’s more, there is no area exactly above under the smooth Normal curve. So ACT scores can be only approximately Normal. To illustrate this fact, find
(a) the percent of ACT scores greater than .
(b) the percent of ACT scores greater than or equal to .
(c) the percent of observations from the distribution that are greater than 27. (The percent greater than or equal to is the same, because there is no area exactly over .)
A Normal curve Estimate the mean and standard deviation of the Normal density curve in the figure below:
Text me The percentile plot below shows the distribution of text messages sent and received in a two-day period by a random sample of females from a large high school.
(a) Describe the student represented by the highlighted point.
(b) Use the graph to estimate the median number of texts. Explain your method.
Python eggs (1.1) How is the hatching of water python eggs influenced by the temperature of the snake’s nest? Researchers assigned newly laid eggs to one of three temperatures: hot, neutral, or cold. Hot duplicates the extra warmth provided by the mother python, and cold duplicates the absence of the mother. Here are the data on the number of eggs and the number that hatched:
(a) Make a two-way table of temperature by outcome (hatched or not).
(b) Calculate the percent of eggs in each group that hatched. The researchers believed that eggs would not hatch in cold water. Do the data support that belief?
The proportion of observations from a standard Normal distribution with values less than is
(a) .
(b) .
(c) .
(d) .
(e) none of these.
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