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The old operation to restore hearing is known to be 30%sucessful. A new operation that restores hearing is being researched. It is known that 88 out of 225 operations using this new method have been successful. Can we justify the claim that the new method is better than the old?
a) Null hypothesis:
b) Alternative hypothesis
c) p-value
d) Conclusion
a study by hewitt associates showed that 79 of companies offer employees flexible scheduling. suppose a researcher
When studying the simultaneous responses to two categorical questions, we should set up a:
For a population with a mean of 60 and a standard deviation of 24, find the z-score corresponding to each of the following samples. What is Om for each equation?
sally inc. surverys customer satisfaction. of 144 customers and finds that 108 are satisfied.1 what is the point
Suppose the batch contains 2% defective syringes. What is the probability that the batch will be accepted? Round your answer to three decimal places.
A sample of size 36 results in a sample mean of 7.1. The value of the test statistic is ____
How is a sampling distribution of the mean similar to and different from a distribution of raw scores? What is the standard deviation of a sampling distribution of the mean called? How is it affected by sample size?
What concepts and constructs would you use to study this phenomenon? How might the concepts or constructs relate to explanatory hypotheses? Explain.
The "average" (mean) tire wore out at 41,000 miles, and the standard deviation was 4000 miles. Approximately what percent of the tires are likely to wear out before 40,200 miles?
Determine the correlatins between pairs of all interval variables (i,e., absences with PE, PE with math, math with writing) How much of the math grade can be explained by the PE grade?
Find historical information on the statisticians who developed statistical tests, such as the normal distribution, Student t distribution, Chi-Square distribution
Regression line drawn as y = c + 1075x, when x was 2, and y was 239, given that y intercept was 11. Calculate the residual
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