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I run various A/B Split tests online. I always set all my tests for 10,000 visitors so page A and B are each equally rotated 5,000 times.
Assess the impact of an event on a population. I ran a survey before the event and then I ran the survey after the event. The collected responses matched between prior to the event and after. I used p
I want to know whether the StdError of the fitted score (SEYhat) can be legitimately interpreted normally for N=1 subject, with only one plotted Y score for each X value.
When estimating the mean of a population, how large must the sample be in order that the 95% error margin is 1/8 the standard deviation?
A machine produces 3 inch nails. A sample of 100 nails is selected, and it is found that 25 are shorter than 3 inches. Find the 95% confidence interval on the proportion of all such nails that are sho
Survey to determine what proportion of new car buyers continue to have their car serviced at the dealership after warranty ends. Estimates 30% of customer do so.
A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a mail survey. What is the sample size required?
In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error and 95% confident. What sample size is needed?
Calculate a confidence level at 95% to get an interval estimate for proportion?
Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an error of less than 5 units. Standard deviation be 6 un
Choose a variable and collect data for at least three different groups (samples). Compare the means of the three groups using the one-way ANOVA technique. Complete the following
Fill in the P (X=x) values in the table to give legitimate probability distribution for the discrete random variable X, whose possible values are -4, 1,2,3 and 6.
Administrative staff based at a business school in the UK are advised to take a 15 minute break from their personal computer after working on it for 90 minutes continuously. A random sample of 36 staf
In a survey of adults, 68% thought that DNA test for identifying an individual were very reliable. You randomly select 24 adults and ask each if he or she thinks DNA test for identifying an individual
In a recent year grade 8 Washington State public school students taking a mathematics assessment test had a mean score of 276.1 with a standard deviation of 34.4. Possible test scores could range from
A newspaper finds that the mean number of typographical errors per page is five. Find the probability that:
Discuss how t test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternativ
Use the given degree of confidence and sample data to construct a confidence interval for the population mean x. Assume that the population has a normal distribution.
Your company asks you to compare a new advertising campaign and the old one. Sample data on the accounts as follows:
Develop a different regression model by recoding x. Use Tukey's four-quadrant approach as a resource and computer to perform a multiple regression analysis on this data to predict y from x values.
Create a graph and draw the regression line based on these two pairs of scores, plus the X value 1 1 and its predicted score on Y.
Find the values of b0 and b1 using the method used in regression, and predict the time in minutes required by the operator to produce the component, after 3 hours of training.
What would the researchers have concluded about the study medication if they had ignored the effect of sepsis on survival in their analysis?
Considering the four weights and assuming the weights are independent with a constant variance, obtain the least square weights of A and B.
Which of the F statistics are significant and what is the effect size for the main effect of fertilizer type? What size effect is this?