A random sample of  n1 = 49  measurements from a population with population standard deviation  ?1 = 3  had a sample mean of  x1 = 9.  An independent random sample of  n2 = 64  measurements from a second population with population standard deviation  ?2 = 4  had a sample mean of  x2 = 11.  Test the claim that the population means are different. Use level of

need help on this one

Please answer: What is the alternative hypothesis of this test? Calculate the difference between the sample mean in the hypothesized mean. According to the P value, what is the mean difference statistically significant? Based on the results, can you reject the null hypothesis? Should you order maintenance repair? 

Suppose we have the following data collected from three randomly-selected counties:  1.What is the sample mean of x?  Of y?    2.What is the sample standard deviation of x?  Of y?  (2 decimal places) 3.Please compute the sample correlation coefficient, r.  (4 decimal places)   County % with HS Degree (x) % in Poverty (y) A 90 5 B 20 25 C 40 15

3.3.16 EQuestion Help Use z scores to compare the given values. In a recent awards ceremony, the age of the winner for best actor was 32 and the age of the winner for best actress was 47. For all best actors, the mean age is 45.2 years and the standard deviation is 8.3 years. For all best actresses, the mean age is 33.7 years and the standard deviation is 12 5 years. (All ages are determined at the time of the awards ceremony.) Relative to their genders, who had the more extreme age when winning the award, the actor or the actress? Explain. Since the z score for the actor is z = and the z score for the actress is z=, the V had the more extreme age (Round to two decimal places.)

In a study on running and happiness, runners indicated the number of miles they ran in a day and their subsequent score on a Happiness Survey (higher score = greater happiness). Runner # of miles (x) Happiness Score (y) 1 16 12 2 4 3 12 14 4 2 8 For these data: The mean of miles run is: 8.50 The mean of the Happiness scores is: 10.00 The standard deviation of the Miles scores is: 5.72 The standard deviation of the Happiness scores is: 3.16 In your submission, please include a copy of the SPSS or Excel output and answer the following: A. What is the r and r? value? B. Based on Pearson's r and r2 value, describe the relationship (direction/strength) that exists between # of miles run and Happiness scores. C. Create a scatterplot for the data using Excel or SPSS (include output in your submission). D. Insert the prediction line from Excel/SPSS on your scatterplot.

How do I find the Standard Deviation and Sample Mean?

The distribution of weights of African bush elephants is skewed to the right with mean 6.42 tons andstandard deviation 1.07 tons. Let the random variable W  represent the weight, in tons, of a randomlyselected elephant. The weight is converted to kilograms using the formula Y= 900W. Which of thefollowing best describes the distribution of Y ? WHAT IS THE CORRECT ANSWER A. Roughly symmetric with mean 5,778 kilograms and standard deviation 1.07 kilograms. B. Roughly symmetric with mean 5,778 kilograms and standard deviation 963 kilograms. C. Skewed to the right with mean 906.42 kilograms and standard deviation 1.07 kilograms. D. Skewed to the right with mean 5,778 kilograms and standard deviation 1.07 kilograms. E. Skewed to the right with mean 5,778 kilograms and standard deviation 963 kilograms.

(5). Calculate SS, variance and standard deviation for the following sample of n=7 scores: 8, 6, 5, 2, 6, 3, 5.

Just answer: According to the P value, what is the mean difference statistically significant? Based on the results, can you reject the null hypothesis? Is the entire staff operating at a good level?