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Q1) From random sample of 1201 Americans, it was discovered that 62 of them lived in neighbourhoods with improper levels of carbon monoxide.
i) Determine the point estimate? Give the symbol and value.
ii) Create a 99% confidence interval for proportion of all Americans who live in a neighbourhood with improper levels of carbon monoxide
iii) What sample size would be required for estimate to be within 1.5 percentage points with 99% confidence if you used estimate of that was earlier obtained.
iv) If you wanted your confidence level to be 95%, would your sample size be larger or smaller?
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
Perform a chi-square test on the following data:
What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.02 of the population proportion?
The following estimated regression model was developed relating yearly income (Y in $1,000s) of 30 individuals with their age (X 1 ) and their gender (X 2 ) (0 if male and 1 if female).
What is the probability that the cereal would be high calorie? In other words, what is P (high calorie)?
Now compute the standard deviation for this distribution.
Create a 95% confidence interval for true mean.
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Describe your re..
As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?
What is your conclusion regarding null hypothesis?
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
Determine the probability of examining a sample mean weight from any 20 women chosen from this population that is less than S (your sample mean) by using population standard deviation?
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