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Finding Normal probabilities using standard normal table or Excel built in functions
Assume a standard normal distribution. Fill in the blanks.
a) P ( z < _____ ) = .9744
b) P ( z < _____ ) = .3974
c) P ( z < _____ ) = .4131
d) P ( z < _____ ) = .8962
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
Explain why the t distribution is used as a part of the confidence interval.
Perform hypothesis testing on one variable's data.
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
At a 5% level of significance, is there enough evidence from this survey to conclude that more than half of all adults would rather have $100 than a day off?
Find out a linear equation in the form P = mt + b (y = mx + b) that gives the population, P, t years from 2010.
The Pearson Product-Moment Correlation Coefficient (r) is a measure of linear relationship between two variables.
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
Assume a one-tailed t -test is being applied to determine if population mean is less than $212. Level of significance chosen is 0.01 and 26 accounts are sampled. Determine the critical value?
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
Determine the sum of these probabilities , and why is the number less than 1
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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