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Explain what the standard error of the mean represents and does the sampling distribution of x look like a Normal distribution if n is 10?
On average, a National Express coach arrives every two hours. What is the probability that only one bus will arrive in a four hour period?
What is the probability that a diner is an undergraduate and has bought a meal and what is the probability that someone who has bought a meal is a postgraduate?
Interpret the estimated coefficient for the toxemia variable and what are the odds of a hemorrhage for infants whose mother had toxemia?
Construct a survival curve based on the product-limit estimate and estimate the median survival time
Construct the ANOVA table (i.e. compute the between and within SS) and test if there appears to be any differences in means (use α = 0.05)
Let X be the number of individuals in a simple random sample of size 50 from this population who get some relief by taking ibuprofen, and let pˆ be the sample proportion. Find the probability th
Give the formula for the proper statistic to use, and also the p-value and An experiment was conducted to compare the weights of the combs of roosters fed two different vitamin-supplemented diets
Construct a 95% con dence interval for the true mean. Based on the con dence interval, is the true mean likely to be 15g and find the minimum weight of the heaviest 5% of cans of soup produced.
What inferential statistical tests are appropriate to answer your research question as to whether past participation and contribution will make a difference in people enjoying, and supporting an eve
The discussion surrounding the ANOVA is very important. This is a widely utilized statistical tool. What is the ANOVA? What is the purpose of the ANOVA? What role does variation have in the disc
Does knowing high school seniors' IQ scores indicate anything about their high school graduation grade point averages and Is there a relationship between a person's sociability and cheerfulness
Explain briefly why ANOVA was the appropriate analysis for these data and finish the ANOVA table giving the F-statistic, degrees of freedom, and approximating the p-value. Show your work. What is your
Calculating the mean, do you expect it to be greater than the median or less than the median. Why?
One of the points is suspected of being a bivariate outlier. When this point is removed, the new correlation is r = -.833. Is this point likely to be a bivariate outlier?
Suppose you want to determine whether students' expected grades at the beginning of an introduction to statistics course are positively related to their final course grade. Write the null and altern
Shown below are the results of a one sample t test. Make up a problem that someone could solve using the printout. Do not make up the data. Just assume the data were collected and produced the given
Is there sufficient evidence at the alpha =0.05 level to support the researcher's claim?
Use the SPSS output to determine if there is sufficient evidence to conclude that Sally bakes a better pie than Pat (i.e., the average rating for Sally at her church is higher than the average ratin
positive correlation between CEO salary and the Stock Price, and therefore, for the good sake of the company's stock value, his salary should be increased. Do you agree with his argument? Explain wh
Identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect relationship. Suggest an explanation for the association.
The East Coast researcher decides to construct a two-sided 99% confidence interval. Which researcher will have the more precise estimate?
List the experiments and random run orders if we are to run a fractional design and describe how you would analyse the data in each of the situations defined in (a) and (b) above.
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI between 25 and 30 is considered overweight. What proportions of children are ov
Compute the Cumulative incidence of stroke in the study and compute the Cumulative incidence of stroke in patients classified as hypertensive at baseline