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A sample of 66 women over the age of 50 used the new cream for 6 months. Of those 66 women, 30 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 60% of women over the age of 50? Test using ?=0.01.
test statistics z= ____.
rejection region z>____.
The stem-and-leaf display below gives the test scores for the students in Prof. Jones' economics class. Use the display to answer the following questions.
Detremine the mean, standard deviation, and variance for this frequency distribution.
suppose z is standard normal random variable. calculate the following possibilities.a.pzgt1.5b.p-0.33 ltz lt1.33c. pz
In standardized form, the normal distribution a) Has a mean of 0 and a standard deviation of 1 b) Has a mean of 1 and a variance of 0 c) Has an area equal to 0.5 d) Cannot be used to approximate discrete probability distributions
find a 95 confidence interval for the slope in each of the following settings note it is y careta. n 25 y 5.3 1.10x
The users are then timed in their ability to setup and program the DVD by performing a series of operations. Which statistical analysis technique should be used? What is the null hypothesis? Can the market researcher get an answer? Why or why not?
a product is made up of two subsystems in series. the first subsystem consists of 15 components in series. the second
The true population regression function, it isn"t. Before leaving this section we should ask and answer the following question. What"s so special about polynomials?
Predict the monthly labor hours required when the X-ray exposures are 56,194, the bed days are 14,077.88, and the average length of patients' stay is 6.89.
A data set of ordered pairs with a negative linear correlation has a coefficient of determination of 85.2%. What is the linear correlation coefficient?
when asked to explain the meaning of the p-value was p 0.03 a student says this means there is only probability 0.03
Jared bets on the number 7 for each of 100 spins of a roulette wheel. Because P(7) = 1/38 he expects to win two or three times. What is the probability that Jared will actually win two or more times?
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