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Standard Deviation, Hypotheses, and Standard Error
1. Define the term standard deviation. Why is it important to know the standard deviation for agiven sample? What do researchers learn about a normal distribution from knowledge of thestandard deviation? A sample of n=20 has a mean of M = 40. If the standard deviation is s=5,would a score of X= 55 be considered an extreme value? Why or why not?
2. Hypothesis testing allows researchers to use sample data, taken from a larger population, todraw inferences (i.e., conclusions) about the population from which the sample came. Hypothesistesting is one of the most commonly used inferential procedures. Define and thoroughly explainthe terms null hypothesis and alternative hypothesis. How are they used in hypothesis testing?
3. Define the term standard error. Why is the standard error important in research using sampledistributions? Consider the following scenario: A random sample obtained from a population hasa mean of μ=100 and a standard deviation of σ = 20. The error between the sample mean and thepopulation mean for a sample of n = 16 is 5 points and the error between a sample men andpopulation mean for a sample of n = 100 is 2 points. Explain the difference in the standard errorfor the two samples.
a certain sum of money amounts to Rs.312 at 4% interest: Rs.324 at 8% interest. find the principal and period of time.
In planning for a major redesign, Beth collected data at her store on several consecutive Saturday mornings. She noticed that customers arrived at the checkout at a rate of approximately 100 per hour. Fully 20 percent of the customers had 10 items..
Significance Testing of correlation coefficient - Test the significance of r
a ball is projected vertically upwards with an initial speed of 10 m s-1 at a height of 2.5m above the ground. in part
how many terms of the series , 24+20+16+-----should be added so that the sum may be 72.
alyssa wants to know what students think about replacing the candy in two vending machines with more health fu ul
How much profit can they expect to earn if they produce 130,000 chips per week? calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph.
A plot of the data points with the best-fit line is given below . What age is predicted by the best-fit line for s height of 70 inches ?
the average number of calories in a 1.5 ounce chocolate bar is 225. Suppose the distribution of calories is approximately normal with standard deviation 10. Find the probability that a randomly selected chocolate bar will have less than 200 calori..
One-half serving of soy sauce contains 389 milligrams of sodium. How many grams of sodium from soy sauce are included in an egg-foo-young dish made from 4 serving of soy sauce? Round result to the nearest tenth of a gram.
The width of a rectangular swimming pool is 74 feet. If the perimeter is 328 feet, what is the area of the pool?
Resigning Probabilities, A company finds that on average 20% of all new employees resign during their first year of employment
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