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The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the sample was 103.
- What is Ho? What is Ha?
- What is the Z-score? What is the P-value?
- Is the result significant at the 5% level? Why or why not?
Set up null hypothesis for associated F test.
Point out your final decision concerning hypothesis test and compute p-value for test.
Describe each of the following types of designs, explain its logic, and why the design does or does not address the selection threats of Trochim and Donnelly (2006):
A dish contains 20 gumballs - 9 blue, 6 red and 5 white. We randomly select two gumballs from the dish without replacement. a) Let X be the number of blue gumballs selected. Complete the probability distribution of X by filling in the appropriate p..
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
Make use of normal probability distribution features of EXCEL to help determine the probability.
Produce the scatter plot for sodium and bp. Do you think there are any outliers?
If garage is robbed, determine the probability doors were left open?
Using the 0.10 level of significance, is there evidence that the population mean is above $300?
A fair coin is flipped 3 times. Compute the odds of flipping 3 tails.
Perform the five-step hypothesis test on the data. - LORA - this is the portion I am responsible for based on using the nonparametric hypothesis testing.
Create a frequency table for the total number of people that prefer each type of music:
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