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Testing for a linear correlation. Construct a scatter plot, find the value of the linear correlation coefficient r, and find the critical values of r from the table below using a=0.05. Determine whether the is sufficient evidence to supporta claim of a linear correlation between the two variables.
CPI and Pizza; The paired values of the consumer pice index and a slice of pizza:
cpi 30.2 48.3 112.3 162.2 191.9 197.8
pizza 0.15 0.35 1.00 1.25 1.75 2.00
Provide a description of one method for estimating the reliability and one method for substantiating the validity of a test.
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
How many degrees of freedom should the researcher use in her t-test critical value assuming that the variances are equal?
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
You sample a group of computers and use the sample statistics to calculate a 95% confidence interval of (-10.95, -1.5). This interval estimates the difference of (average boot time (HDD) - average boot time (SSD)). What can we conclude from this i..
When the p-value is used for hypothesis testing, the null hypothesis is rejected if
Please assist regarding an index based on how people feel about the economy. In this case, the base was 1985 and set at 100.
What are the possible combinations of coins that Sanjay could have received in change?
A study of 100 sedentary people in this age group is planned to test whether they have a higher or lower level of plasma glucose then the general population.
We want to test the hypothesis that the population variances are equal.
The Duracells had an average lifetime of 18.67 hours (SD = 1.176 hours) while the Energizer batteries had an average lifetime of 16.83 hours (SD = 2.878 hours). Assuming the population standard deviations to be equal, what is the test statisitic a..
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