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"Adults Who Stutter: Responses to Cognitive Stress," published in the Journal of Speech and Hearing Research in 1994, reported speech rate, in words per minute, for nine stutterers under conditions of stress.1 Which form of inference should be performed first: a confidence interval for population mean difference in speech rates (stress versus normal conditions), or a hypothesis test to determine if conditions of stress affect speech rates of stutterers in general?
suppose that 70 of eligible residents of phelps county will actually vote in an upcoming election. consider randomly
1. a sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at 50 per share
Ninety of these flashlights are selected at random from the production line to be tested, and 15 are found to be defective. The population is?
Explain how you can use both T tests in your profession? Restate the research question into a null hypothesis: Does a memory-enhancing drug have an effect on the ability of a group of Alzheimer's patients.
The incomes of trainees at a local mill are normally distributed with a mean of $1100 and a standard deviation $150. What percentage of trainees earn less than $900 a month?
For the binomial sample information summarized below, indicate whether the sample size is large enough to use the large sample approximation to construct a confidence interval for p.
The scores, X, of an examination may be assumed to be normally distributed with μ = 70 and σ2 = 49. What is the probability that:
Find the margin of error in estimating the population mean: confidence level = 94%; sample size=86; sample mean = 113.5; and standard deviation = 12.7.
What's the design? Read each brief report of statistical research, and identify whether it was retrospective or prospective.
45 Human Resource major students and 25 Culinary Arts major students had arrived. What is the empirical probability that the next student to come will be a Human Resource Major?
Use the 0.05 level of significance in testing whether the population means might be equal, then construct the 95% confidence interval for each population mean.
Find a 99% confidence interval for the proportion of registered users with false phone numbers and explain what it indicates. Use language that a manager could easily understand.
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