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Probability using Z-score. Find the probabilities that a random variable Z having a standard normal distribution will take on a value:
a) Between 0.87 and 1.28
b) Between -0.34 and 0.62
c) Greater than 0.85
d) Greater than -0.65
Use suitable one or two sided test for null hypothesis of no difference in them then changes rating between groups at 0.10 significance level.
what is the probability that at least 8 of the words on the test are words that the student knows?
If random sample of thirty six customer transactions points out that sample mean withdrawal amount is $172, is there evidence to think that population mean withdrawal amount is no longer $160? Determine the mean of data above?
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
If x is a binomial random variable where n = 100 and p = .1, find the possibility that x is less than or equal to 10 using the normal approximation to the binomial.
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
Find out a plausible value r for correlation between vehicle weight and miles per gallon (mpg) shown in the scattergram below?
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
A regression model between sales (Y in $1,000), unit price (X 1 in dollars) and television advertisement (X 2 in dollars) resulted in the following function: = 7 - 3X1 + 5X 2 For this model SSR = 3500, SSE = 1500, and the sample size is 18...
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