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Starting with the formula and substituting values for each variable, provide all the steps of the calculations to arrive at a z-score of +1.4. Show all steps of the calculations to arrive at a z-sco
Out of 87 observations, 67% were successes. Ho: p = 0.54. Confidence level: 98%. What is the value of the appropriate test statistic used to test the null hypothesis?
The National Assessment of Educational Progress (NAEP) periodally administers tests on different subjects to high school students. In 2000, the grade 12 students in the sample average 301 on the mat
A study was conducted by Enron Research to test for a difference inthe mean number of critical care patients in rooms at three area hospitals-Sentara, Inova, Winchester. The following shows the resu
270 randomly selected light bulbs were tested in a laboratory, 98 lasted more than 500 hours. Find a point estimate of the true proportion of all light bulbs that last more than 500 hours.
95 numbers are rounded off to the nearest integer and then summed. If the individual round-off error are uniformly distributed over (?.5,.5) what is the probability that the resultant sum differs fr
A certain enzyme in the liver of fish is considered an indicator of trace amounts of a dangerous pollutant that is difficult to detect by chemical methods.
Find the most powerful test with significance level alpha = 5% to test Ho: theta = 2 against Ha: theta = 1. How does the nature of the test statistic and rejection region for the most powerful test
If Z is a standard normal variable, what is the probability P(-0.73 < Z < 2.27)?
Suppose that the hypotheses H0:P=.35 and Ha:p>.35 are to be tested. Calculate the ovserved z-statistic for the sample data where forty our of eighty test subjects have the characteristic of inter
A researcher wishes to estimate, with 95% confidence, the proportion of adults who have high-speed internet access. Herestimate must be accurate within 1% of the true proportion.
Suppose a recent poll of American Househoolds about pet ownership found that for households with one pet, 39% owned a dog, 33% owned a cat, and 7% owned a bird. suppose that three households with o
The mean price of ground beef in 75 cities in the midwest is 2.11 and teh standard deviation is .56. a midwest grocer is selling ground beef for 3.25. What is the price in standard units? Assuming t
IQ scores have a mean of 134. A sample of 13 people had a mean IQ of 129 with a SD of 9. Find the value of the test statistic. Round to three decimals.
Use the given data to find the minimum sample size required to estimate a population or proportion or percentage.
Since the P Value is (greater or less) than the level of significance (reject, or not reject) null hypothesis. There is or is not sufficient evidence to conclude that the fund has moderate risk at the
The Organization for Equality in the Workplace (TOEW) is studying the gender gap in starting pay for people with bachelor's degrees. Samples of 180 women and 190 men who recently graduated from Big
One concern about the depletion of the ozone layer is that the increase in UV light will decrease crop yields. An experiment was conducted in a green house where soybean plants were exposed to varyi
Being a wise student of statistics, you decide to stand back and observe the outcome of the next ten games before deciding whether to pay your three dollars to play the game. You have just conducted
The worker at a carnival game claims that he can communicate with a small magic rock and to prove it he tells you to hide it in your hand behind your back and he will identify the hand holding the r
A bicycle factory runs two assembly lines, A and B. 97% of line A's products pass inspection and 89% of line B's products pass inspection. 40% of the factory's bikes come off assembly line B and the
A biologist has found that 40% of all brown bears are infected with trichinosis. 10 brown bears are tested for trichinosis. What is the probability that less than 3 will have trichinosis? Please sho
Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 66 and standard deviation 11. How many students w
Use normal approximation to estimate the probability of getting less than 45 girls in 100 births. Assume that boys and girls are equally likely.