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Find the required possibility.
1. Shopper Trak is a hidden electric eye designed to count the number of shoppers entering a store. When two shoppers enter the store together one walking in front of the other, the following possibilities apply. There is a 0.99 probability that the first shopper will be detected and a 0.94 possibility that the second shopper will be detected and a 0.93 probability that both of them will be detected by the device. What is the probability that the device will detect as a minimum one of the two shoppers entering together?
2. A statistics professor has found that the probability is 0.76 that a student gets a B- or above for the final examination. He also found that the probability of 0.66 that a student gets a B- or above for both the final exam and the course. If a randomly selected student has already gotten a B- or above for the final exam taken yesterday what is the probability he will get a B- or above for the course when the grade report arrives next week?
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
Find the standard error of the difference in sample means,
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
Draw a normal probability plot for residuals using excel or Minitab. Do the residuals seem normally distributed? If yes, why?
The Central Limit Theorem states that the sampling distribution of means is:
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
The ANOVA table is given below,as well as a table of means and standard deviations for the three groups. Evaluate the t statistic for testing contrast
Now compute the standard deviation for this distribution.
Use a 5% significance level to test the claim that there appears to be a difference in the effectiveness of the two diets.
What kind of statistical test best did you use?
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