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Dr Zak developed a test to measure depression. He sampled 100 university students to take his five item test. The group of students was comprised of 30 men and 70 women. In this group four persons were African American, six persons were Hispanic and one person was Asian. There were five yes/no questions Yes =1 and No =0. The five items are summed giving a total score of 5, where the mean was 3.5 and the standard deviation is .5.
Billy scores a 5, what is his standard score ?
Of 346 vending machines tested, 12 are found to be defective. Construct the 98 % confidence interval for the proportion of all defective vending machines.
If you were to accept the null hypothesis, even though the null hypothesis was false, what type of error would you have commited?
Consider the following portion of an electric circuit with three relays. Current will flow from point A to point B if there is at least one closed path when the relays are activated. The relays may malfunction and not close when activated.
Is there evidence of a significant difference in the proportion who get their news primarily from newspapers between those 36 to 50 years old and those above 50 years old? (use α = 0.05)
Why is sampling strategy important? Please provide one or two examples from your work or past experience?
Iindependently of one another. Two hundred seeds of such a cross are raised, and 142 turn out to be blue-flowering. Are the data consistent with the model?
Assume that x has a normal distribution, with the specified mean and standard deviation. Find the indicated probabilities.
What is the probability that a cereal would both high calorie and high fiber? In other words, what is P (high calorie and high fiber)?
Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10-year period from COPD, whereas only 24 such deaths would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excess..
A company is conducting a survey of 235 people to measure the level of interest in a new product. Assume that the probability of a randomly selected person's being "very interested" is 0.88
In the game of roulette, a ball is dropped into a spinning wheel, finally landing on one of the wheel's 38 different slots. The wheel has 18 black slots, 18 red slots, 1 green zero, and 1 green double-zero. Suppose the wheel has landed on red 9 ti..
A random sample of 346 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contingency table below.
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