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Question: Assume that female students' heights are normally distributed with a mean given by µ = 64.2 in. and a standard deviation given by σ = 2.6 in.
a. If one female student is randomly selected, find the probability that her height is above 63.0 in.
b. If 100 female students are randomly selected, find the probability that they have a mean height greater than 63.0 in.
A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potential customer making a purchase is .10. What is the probability the salesperson will make exactly two sales in a day?
Start rolling dice until a particular number, say 3, is obtained, and keep track of how many rolls are necessary. Repeat 100 times. Then find the average.
Is this statistically significant evidence that the true mean diameter is greater than 20 millimeters? Set up the hypothesis, and enter your P-value below, rounded to four decimal places.
a two-tailed test of hypothesis was conducted and 60 values were above the median. computed z 1.61. at the 0.05 level
Use the sample data to construct a 95% confidence interval estimate of the difference between the two rates of lost baggage. Does there appear to be a difference?
If the rainfall was recorded on 20 (instead of 10) randomly selected days throughout the year, the standard error of the mean would be equal to?
company w is testing a sales software. their sales force of 500 people is divided into four regions northeast southeast
Define research question and response Take a sample of adolescents without acne Double-blind randomized controlled trial.
Two fair six-sided dice are tossed independently. Let X be value of first die, and Y value of second. Find out the expectations of following random variables.
Using the .05 level, do the results support the researcher's theory? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
suppose the probability is 0.8 that any given person will believe a tale about the transgressions of a famous actress.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
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