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The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months.
a)What is the probability that a randomly selected watch will be in working condition for more than five years?
b. The company has a three-year warranty period on their watches. What percentage of their watches will be in operating condition after the warranty period?
c. What is the minimum and the maximum life expectancy of the middle 95% of the watches?
d. Ninety-five percent of the watches will have a life expectancy of at least how many months?
Chi-square tests are great to show if distributions differ or if two variables interact in producing outcomes. What are some examples of variables that you might want to check using the chi-square tests? What would these results tell you?
If 64 students were randomly sampled, the probability that the sample mean of the sampled students exceeds 73.5 minutes is approximately 0.
The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is ..
A sample of n= 16 scores has a mean of M = 45 and SS = 960. Calculate the sample standard deviation (s) and the estimated standard error for the sample means (SM).
The Ohio Department of Highways is in the process of selecting a new paint for highway use. Four different paint companies have been contact regarding this need and each of the companies has supplied paint for testing.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
Company wishes to exceed on-time rate of competitors at new hub. Hundreds of flights arrive at location daily. Determine the main advantages and disadvantages of employing sampling in application?
Determine the variance of firm's profit for the month.
A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
21st Century Insurance Company claims that telephone calls for policy holder information are answered in at most 3 minutes. A random survey of 36 phone calls results in the mean 3.3311 and standard deviation 2.1788.
If random samples, each with n = 4 scores, are selected from a normal population with MK = 80 and o=10
With 95% confidence, what is the margin of error (to 2 decimals)? What is the 95% confidence interval estimate of the population mean?
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