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The test scores on a 100-point test were recorded for 20 students:
71 93 91 86 7573 86 82 76 5784 89 67 62 7277 68 65 75 84
a. Can you reasonably assume that these test scores have been selected from a normal population? Use a stem and leaf plot to justify your answer.
b. Do the sample data suggest that the average test score is more than 75? Use α = 0.05.
c. If these students can be considered a random sample from the population of all students,find a 95% confidence interval for the average test score in the population.
SAT verbal scores are normally distributed with a mean of 423 and a standard deviation of 91. Use the Empirical Rule to determine what percent of the scores lies between 423 and 514.
graphical depiction of data histogram and ogive1. make a grouped frequency distributionusing 35000 - 39999 as the
GRAPH THE DATA IN A CHART. DESCRIBE THE TREND YOU SEE. CALCULATE THE MEAN AND STANDARD DEVIATION. CONSTRUCT A STEM AND LEAF DISPLAY OF THESE DATA.
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three cards are drawn without replacement from a standard deck of fifty-two cards. find the probability of these
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The probability of getting a big order currently under negotiation is 0.4. The probability of losing money this quarter is 0.5.
according to the american lung association 90 of adult smokers started smoking before turning 21 years old. ten smokers
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