Mathematics, 22.04.2021 18:20 allanarayos5597
In 2017, the average reading score of the fourth graders in the United States was 222 points. In a simple random sample of 16,000 fourth graders taken nationally in 2019, the average reading score is 221 and the SD is 40 points. Is the national average reading score for fourth graders in 2019 different from what it was in 2017? Or is the observed difference just chance variation? Perform a test of hypotheses to answer the question, in the following steps.
a) State an appropriate null hypothesis in non-technical terms and also as a set of assumptions about random variables.
b) State an appropriate alternative hypothesis.
c) What test statistic are you going to use? Justify your choice
d) Find an exact or approximate p-value.
e) At the 5% level, what is the conclusion of the test? Why?
Answers: 3
Mathematics, 21.06.2019 19:00
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Mathematics, 21.06.2019 19:00
The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean
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Mathematics, 21.06.2019 22:20
Question 4 of 10 2 points what is the second part of the process of investigating a question using data? a. rephrasing the question o b. describing the data c. collecting the data o d. making an inference submit
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Mathematics, 21.06.2019 23:00
The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?
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In 2017, the average reading score of the fourth graders in the United States was 222 points. In a s...
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