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A researcher finds a correlation between self esteem and shyness is -0.50, which is significant for his sample. Interpret this correlation.
What does a correlation coefficient tell us? Why are correlation coefficients useful when assessing reliability?
What are the 2 ways in which researchers assess the reliability of their measures? Be sure you understand the difference among these 2 approaches to reliability.
What is validity with respect to a research project? Discuss the different types.
What is validity with respect to the measurement of a psychological construct?
Write a hypothesis about the length of words in newspapers and magazines, Design and carry out an investigation to test your hypothesis.
The distribution of diastolic blood pressures for the population of female diabetics between the ages of 30 and 34 has an unknown mean μd and a standard deviation σd = 9.1 mm Hg.
records pertaining to the hourly brown trout catch have been obtained in order to include this parameter into a
A random sample of 43 light bulbs has a mean life of 677 hours with a standard deviation of 90 hours. Do you have enough evidence to reject the manufacturer's claim?
For the constant sound group: 1, 10, 1, 10, 1, 9, 7, 3. And for the no sound group: 4, 3, 6, 4, 5, 8, 4, 9. A. Assume that the standard deviations are equal and find the test statistic for the test that the between mu1 and mu2 is zero.
How might you deal with outliers that are not due to coding errors? Explain your reasoning. Write a sample result section, discussing your data screening activity.
Assuming that n = 6 for both samples, calculate each of the sample variances, then calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances.
Election officials take a random sample of 100 signatures and thoroughly investigate them to find that 84% are valid. Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
Blood type AB is found in only 3% of the population†. If 260 people are chosen at random, find the probability of the following. (Round your answers to four decimal places.)
the acceptable level for insect filth in a certain food item is 4 insect fragments per 10 grams. a sample random of 50
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