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1.(1) The claim by a weight loss Company is that on average, the client will lose 10 pounds over ...

first 2 weeks. 50 people who joined the programme are sampled, their weight loss is 9 pounds with a standard deviation of 2.8 pounds. Can we conclude at the .05 level that a person joining the programme will lose less than 10 pounds? (2) The following is a random sample of 90-day futures prices in dollars for 1 troy oz. of silver from The Wall Street Journal issues in May and June of 1997: 4.74, 4.77, 4.87, 4.91, 4.83, 4.72, 4.92, 4.86, 4.97, 4.71, 4.90, 4.93, 4.75, 4.88, 4.79, 4.83, 4.89. Required: a. Calculate the mean b. Median c. Standard deviation of the 90-day future price of silver data (3) A mining company needs to estimate the average amount of copper ore per ton mined. A random sample of 50 tons gives a sample mean of 146,75 pounds. The population standard deviation is assumed to be 35.2 pounds. Required: a. Give a 95% confidence interval for the average amount of copper in the population of tons mined. b. Give a 90% confidence interval for the average amount of coper per ton c. Give a 99% confidence interval for the average amount of coper per ton (4) An e-commerce Website gets 2,385 visitors on a particular day. Among these, 1790 visitors explore the products by looking at more pages at the site. Among these 1790 visitors who explore the products, 387 make a purchase. Required: a. If a visitor chosen at random from all those who visited the site, what is the probability that the visitor explored the products b. If a visitor is chosen at random from all those who visited the site, what is the probability that the visitor made a purchase. c. If a visitor is chosen at random from all those who explored the products, what is the probability that the visitor made a purchase. d. Which of the preceding three probabilities is relevant to the design of the home page that leads to product page.
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2.Hypnosis tests for equality of 2 means. Gibbs baby good company wants to compare weight gain of infants using their ...

infants using their formula brand vs. a competitors. A sample of 40 babies using their product revealed a mean weight gain of 7.6 lbs in the first 3 months after birth. The standard deviation of the Gibbs sample is 2.3 lbs. A sample of 55 babies using the competitors brand had a mean increase of 8.1 lbs with a standard deviation of 2.9 lbs. At the 5% significance level, can we conclude that babies using Gibbs brand gained less weight?
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3.The Welcher Adult Intelligence Test Scale is composed of a number of subtests. On one subtest, the raw scores have ...

aw scores have a mean of 40 and a standard deviation of 5. Assuming these raw scores form a normal distribution: a) What number represents the 55th percentile (what number separates the lower 55% of the distribution)?
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4.The average amount of time that high school seniors spend studying weekly is 6.5 hours with a standard deviation of ...

rd deviation of 3.2 hours. A sample of 35 high school seniors is selected. Find the following values, if possible. Please round your answers to four decimal places. If you should not find a probability, please write NA for your answer. What is the probability that the sample mean studying time is between 4 and 5 hours? What is the probability that the sample mean studying time is less than 6 hours? What is the probability that the sample mean studying time is more than 8.5 hours?
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5.35. The selling prices for homes in a certain community are approximately normally distributed with a mean of $321,000 and ...

a mean of $321,000 and a standard deviation of $38,000. Estimate the percentage of homes in this community with selling prices  (a) between $283,000 and $359,000.  %  (b) above $359,000.  %  (c) below $207,000.  %  (d) between $207,000 and $359,000.  %
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6.33. Suppose that the scores on a statewide standardized test are normally distributed with a mean of 63 and a ...

63 and a standard deviation of 2. Estimate the percentage of scores that were  (a) between 59 and 67.  %  (b) above 69.  %  (c) below 59.  %  (d) between 57 and 67.  %
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7.A population has a standard deviation of σ = 29 and a mean of μ = 155. On average, how ...

ence should exist between the population mean and the sample mean for n = 10 scores randomly selected from the population?
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8.A survey of 47 people was conducted to compare their self-reported height to their actual height. The difference between reported ...

e difference between reported height and actual height was calculated. You're testing the claim that the mean difference is greater than 0.6. From the sample, the mean difference was 0.7, with a standard deviation of 0.74. Calculate the test statistic, rounded to two decimal places Incorrect
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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

mathematicsalgebra Physics