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Streams. In performing research for an ecology class, students at a college in upstate New York collect data on streams each year.
They record a number of biological, chemical, and physical variables, including the stream name, the substrate of the stream (limestone, shale, or mixed), the acidity of the water (pH), the temperature (°C), and the BCI (a numerical measure of biological diversity).
data on the average size of a soda in ounces at all 30 major league baseball parks are as follows 14 18 20 16 16 12 14
Plot the defense expenditures time-series data and describe any trends across the time 1980 to 2004. Plot the %GNP time-series data and describe any trends across the time 1980 to 2004.
Complete hypothesis test using a 5% level for risk with directional research hypothesis.
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 8 IQ points of the true mean.
Find a 95% confidence interval for the difference between this year and last year in the mean number of units sold at all retail stores and interpret the results.
This problem related to Basic Statistics and it is about computing the probability of drawing a pink ball first and a green ball
The SAT scores of students are normally distributed with a mean of 950 and a standard deviation of 200. What percentage of students score between 1100 and 1200?
a population is estimated to have a standard deviation of 10. we want to estimate the population mean within 2 with a
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
We conclude that memory of food intake in the distant past is fair to poor." Explain to your audience why r=0.217 points to this conclusion.
With µ as the population value of mean annual net income, formulate null and alternative hypotheses consistent with testing Willco management’s claim. Assuming that Willco’s net income is at least approximately normally distributed, identify the appr..
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