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A random sample of size 9 is collected from a normally distributed random variable. The sample mean is 6.507 and the sample variance is 3.99. An exact 80% confidence interval for the mean of the random variable is required. How should you calculate confidence interval using quantiles from a t-distribution and with how much degree of freedom? Is it approprait to use in calculating the confidence of interval quantiles from a normal distribution?Explain and show work.
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
At a 0.05 level of significance, determine if there is a significant difference in the mean weekly units of production for the three types of work schedules (perform all six steps of hypothesis testing and show the ANOVA table).
a coin is tossed 7 times. let a be the event that the first toss is heads. let b be the event that the fifth toss is
The rockets are playing Lakers tonight in basketball. The lakers average 90 points a game, with a SD of 10. What would the rockets need to score to be 80% sure of victory, 90% sure, 95% sure.
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
How would you respond if someone told you that the correlation between education level and salary was 1.27?
the standard deviation of a distribution is 20. if a sample of 225 is selected what is the standard error of the
A psychologist has developed a test to measure self-control. The test is normed so that it has a mean of 100 and a standard deviation of 15... The scores are normally distributed in the population of college students used to develop the test.
They both want to know what family member typically does the research about possible honeymoon destinations, and who primarily makes the decision on selecting the destination.
If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
purpose students will conduct one brief research exercise that will be written up as a research report using apa
What is your conclusion? Are the two variables independent?
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