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Find the proportion. Consider the ISTEP scores, which are approximately Normal, N(572, 51). Find the proportion of students who have scores less than 620. Find the proportion of students who have scores greater than or equal to 620. Sketch the relationship between these two calculations using pictures of Normal curves similar to the ones given in Example 3.36.
Is there any evidence to suggest the mean width of the channel is greater than 23 meters? Use a = 0.01.- Find the p value associated with this hypothesis test.
200 students took a test. The scores were normally distributed. Your score was in the 60th percentile. How many people scored at or below your score?
What percentage of the pins will be acceptable to the customer? In order to improve percentage accepted, the production manager and the engineers discussadjusting the population mean and standard deviation of the length of the pins.
What type of research design is the strongest when I what to adopt a new educational program? Using a pre-test and post-test with control group, the previous method but without the control group.
At the 5% level of significance, is there evidence of a difference among the mean access read times for the three files sizes?
If λ= 0.45 and µ = 0.55 how many packets the buffer needs to hold to have a drop rate smaller than 10-6 (one packet dropped for every million packets handled) What is the probability of buffer overflow?
In 2011 Pew research asked a random sample of 799 U.S. teens about their internet use, and 49% of those teens reported that they had misrepresented their age online in order to gain access to websites or online services
Draw a normal probability distribution (bell curve) on a piece of paper and mark the center line (mean). (no need to send me the sketch-just tell me your answer.
Determine which groups differ in average shelf life. Give test statistic, hypothesis, decision rule and hypothesis
Find the value of, the standard deviation of the distribution of sample proportions. Write only as a number. Round to two decimal places.
Square root of population variance
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
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