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The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's homepage is approximately 20 minutes. The library wants to take a sample to statistically estimate this mean. How large will the sample need to be to estimate the mean within0.26 of 1 standard deviation with 0.98 confidence? (Round you answer up to the nearest whole number.)
What is the 95% confidence interval for the difference between the mean prices of the two models?
About 40% of the general population donate time and energy to community projects. Suppose 15 people have been randomly selected from a community and each asked whether he or she donates time and energy to community projects.
Standard deviation of the population is 9 hours. Give the null and alternative hypotheses. Compute the test and p-value. Use a=0.01 to make your conclusion based on the p-value.
a shipment of 20 tv tubes contains 16 good tubes and 4 defective tubes. three tubes are chosen successively and at
compute profit diagrams for the following ratio spreadsa buy 950-strike call sell two 1050-strike callsb buy two
Portfolio B's yearly return is normally distributed with a mean of 0.04 and a standard deviation of 0.06. Based on this information, what is the probability that over the next year, the return on portfolio A is lower than the return on portfolio B?
suppose a coin having probability 0.7 of coming up heads is tossed three times. let x denote the number of heads that
1.we are establishing a quality control program for a process and need to establish the mean and standard deviation for
An elevator has a design capacity of 2,560 pounds and a posted limit of 16 passengers. The weight of adults is approximately normal with a mean of 150 pounds and standard deviation of 20 pounds.
A U.S. Department of Justice report included the claim that "in spouse murder cases, wife defendants were less likely to be convicted than husband defendants
You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
a die has half of the faces red and the other half black. the die is rolled 3 times. let the random variable x
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