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A simple random sample of 47 adults is obtained and each person's red blood cell count (in cells per microliter) is measured. The sample mean is 4.44. The population standard deviation for red blood cells counts is 0.56. Assume all conditions are satisfied for inference to all adults.
a. Construct a 99% confidence interval for ux, the mean red blood cell count for all adults. Round 2 decimal places
upper bound:
lower bound:
b. Suppose the level of confidence decreases. What would happen to the width of the confidence interval?
Stay the same, increase or decrease?
Are the findings statistically significant? Why or why not? Describe the process you used to make this determination and provide the level of significance.
The p-value of the test is closest to:
At the 0.01 level of significance, test the claim that the mean is less than 342 km. Should the storage yard be moved? Give your reasons.
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if the tail of a normal distribution contains exactly 2.5 of the scores then what is the z-score value that separates
two hundred single sport athletes were cross-classified according to gender as
A mean of 6.7 minutes and a standard deviation of 2.2 minutes. For a door selected at random, what is the probability the assembly time will be 5 minutes or less?
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
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data analysis problem for the data set below calculate the following mean or average variance standard deviation mode
what is the required sample size is the error is to be less than 1/2 hour with a 95% level of confidence?
From time to time, one branch office of a company must make shipments to a certain branch office in another state. There are three package delivery services between the two cities where the branch offices are located.
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