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Lays Inc. packages potato chips in small bags. The mean number of chips in a bag is 20, with a standard deviation of 3. Lays produces 100,000 bags of chips per day. How many bags will have less than
Morton Mercado, the CFO of Kanton Company, carefully developed the estimates of the firm's total funds requirements for the coming year. These are shown in the following table:
Describe the population of interest.How many of the students in the sample worked last month? Describe the variable, amount earned by a working college student last month, using one graph, one measur
For a normal distribution with a zero mean and standard deviation of one : Use 10 random variables samples to compute the average and variance Repeat 100 times, use the 100 calculated averages to co
The number of customers at Quiet Morning Bakery is believed to follow a Poisson distribution with a mean of 2 customers per minute. During a randomly selected one minute interval, what is the proba
A manufacturer claims the average life of a product is 500 hours. The lifetime of the product is assumed to follow an exponential distribution. What is the probability that the product will last bet
They expect that about 60% of the student body would respond favorably. What sample size is required to obtain a 95% confidence interval with an approximate margin of error of 0.08? Suppose that 50%
You want to develop a 90% confidence interval with a margin of error of 7. If the population standard deviation is 49, what size sample do you need?
Laboratory experiment shows that the life of the average butterfly is normally distributed with a mean of 18.8 days and a standard deviation of 2 days. Find the probability that a butterfly will liv
Give a 90% confidence interval for Leroy's free-throw success probability for the new season. Are you convinced that he is now a better free-throw shooter than last season?
(a) Give a 95% con?dence interval for the mean blood pressure in thepopulation from which the subjects were recruited.(b) What conditions for the population and the study design are required by the
In a study of the effect of diet on cholesterol, rats were fedseveral different diets. 2 One diet had 5% added ?ber from oat bran. The studyreport gives results in the form "mean plus or minus the s
The previous exercise is very important to your understanding of tests of significance. If you don't use the applet, you should dothe calculations by hand. (Your results may differ slightly from tho
You tell your audience that you ran a t-test to compare the depression levels of 1000 people taking the medication to 1000 people not taking the medication. You point out that the mean level of depr
The mean score for girls was 11.1 with a standard deviation of 3.2. Is there a significant difference between groups? Be sure to state H0, state H1, calculate and state the test statistic, and provi
This past year, a Gallup poll surveyed 1228 households in the U.S about gun ownership. Of those surveyed, 435 said they had at least one gun in their home. Find and interpret the 95% confidence inte
A random sample of 44 UNLV students is taken. The average age in the sample was 20.2 years with a standard deviation of 3.4 years. Construct and interpret a 95 % confidence interval for the average
If a manager believes that the required sample size is too large for a situation in which she desires to estimate the mean income of blue collar workers in a state, which of the following would lead
The weights of bags of candy are normally distributed with a mean of 28 ounces and a standard deviation of .28 ounce. Bags in the upper 3.5% are too heavy and must be repackaged. What is the most a
Which of the following statements is true with respect to the t-distribution?
The larger the sample standard deviation, the narrower will be the interval estimate, all other things being equal.
The American Veterinary Medical Association conducted a survey of veterinary clinics to estimate the proportion that do not treat large animals (cows, horses, etc.).
A true/false pop quiz contains seven questions. What is the probability that when guessing, a student will get at least one question correct? (Round to the nearest hundredth)
In a recent survey of 800 Quebec residents, 28 % thought that Quebec should seperate from Canada. In the same survey, 82 % agreed Quebec society is distinct from the rest of Canada.
Use the following information to answer the question. Suppose that a recent poll of American households about pet ownership found that for households with a pet, 39% owned exactly a dog, 33% owned a