Question

When 100 box turtles are weighed and aged, the sample covariance
between age and weight is 7.3. The sample variance of weight is
20.3 kg^{2}, and the sample variance of age 622.3
month^{2}.

a. What is the estimated correlation between the age and weight of
box turtles?

b. Is the correlation statistically significant?

c. What proportion of variation does the association between age and weight account for?

d. If the sample size was 1000 instead of 100, would the correlation be stastically significant?

e. If the sample mean age and weight are 43.2 years and 15.3kg respectively, regress weight against age.

Answer #1

True and False
a) In a random sample of 100 observations from a normal
distribution, the inter-quartile range will contain approximately
68 of the observations. ____
b.) In a one-tailed test where n=20, the value of the Z-test
statistic equals -1.81. If α were set at 0.01, this test would be
considered significant. ____
c.) If a statistical test is significant at the 1% (alpha =
0.01) level, then it must also be significant at the 10% (alpha =
0.10)...

1. For a pair of sample x- and y-values, what is the difference
between the observed value of y and the predicted value of y? a) An
outlier b) The explanatory variable c) A residual d) The response
variable
2. Which of the following statements is false:
a) The correlation coefficient is unitless. b) A correlation
coefficient of 0.62 suggests a stronger correlation than a
correlation coefficient of -0.82. c) The correlation coefficient,
r, is always between -1 and 1....

Calculate the mean, median, mode, variance (population) and
standard deviation (sample) for the following test grades: 65, 60,
67, 71, 75, 80, 65 Use this information to answer questions #1-4.
Question 1 (0.5 points) Saved The mode is: Question 1 options: 65
60 There is no modal category 75 71 Question 2 (0.5 points) Saved
The median is: Question 2 options: 67 65 80 66 None of the above
Question 3 (0.5 points) What is the approximate population variance
for...

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