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You are testing the null hypothesis that there is no linear relationship between two variables, X and Y. From your sample of n=10, you determine that r=0.80.
a. What is the value of tstat?
b. At the a=0.05 level of significance, what are the critical values?
c. Based on your answers to a and b what statistical decision should you make?
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
Point out your final decision concerning hypothesis test and compute p-value for test.
Equation of the regression line - Evaluate the equation of the regression line and Find y' when x=47 years.
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
A beverage company is trying to ?nd out the distribution of the breaking strength of their glass bottles. Fifty bottles are selected at random and tested for breaking strength, with the following results (in pounds per square inch):
Also, assume that X = number among 20 randomly selected coffee purchasers who select a national brand, and that the random variable X follows the binomial distribution.
Determine the probability that employee will make 28 or more sales during 100-call shift? Allocate a Random Variable x.
What descriptive summary measures would you use to present the data. which measure is the best to use and which is the worse and why?
Use the central limit theorem to find the probability that the average number of moths in 30 traps is greater than 0.6. Give your answer to four decimal places.
Estimating the individual score using normal distribution - blood pressure higher than what amount?
Compute the standard error of estimate, and interpret its meaning.
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