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A company claims that on average, when exposed to their toothpaste, 45% of all bacteria related to gingivitis are killed. You run ten tests and find that the percentages of bacteria killed among these tests are 38, 44, 62, 72, 43, 40, 43, 42, 39, 41.
The mean and standard deviation of these values are X‾ = 46.4 and s = 11.27. Assuming normality, test the hypothesis that the average percentage is 45 with α = .05.
Team Sports Inc. sells sporting goods to high schools and colleges via a nationally distributed catalogue. Management at Team Sports estimates it will sell 2000 Wilson Model A2000 catcher’s mitts next year.
1 every time you go to a beach for vacation you take home a little sand to keep as a souvenir. over your lifetime you
State along statistical certainty there is a difference among the population proportions of those favoring Statement.
Valuation of an MNC Yahoo! has expanded its business by establishing portals in numerous countries, including Argentina, Australia, China, Germany, Ireland, Japan, and the United Kingdom.
The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation of 6. Find the percentage of students that scored above 70.
To investigate he selects a sample of eight weeks and determines the number of new cars sold and the number of sales people on duty for that week. a) What are the dependent and independent variables?
Describe the "third variable problem" as it relates to correlation and provide an example of how you might see this played out in your own field.
What is the critical value at .1 significance? Can we conclude the mean lifetime of light bulbs made by this manufacturer differs from 48 months?
binary communication system transmits bit 0 or 1 every bit interval. probability of transmitting bit 1 and 0 are
a survey of 100 recent fatal traffic accidents showed that 60 were alcohol-related. find the 95 confidence interval of
At a party there are 30 students over age 21 and 20 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.
A component has an exponential time-to-failure distribution with a mean of 10,000 hours. The component has already been in operation for its mean life. What's the probability that it will fail by 15,000 hours?
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