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1. A manufacturer claims that their light bulbs have an average life span of µ = 1200 hours with a standard deviation of σ = 25. If you randomly test 36 light bulbs and find that their average lifespan is X‾ = 1150, does a .95 confidence interval for µ suggest that the claim µ = 1200 is unreasonable?
2. Compute a .95 confidence interval for the mean in the following situations: (a) n = 12, σ = 22, X‾= 65, (b) n = 22, σ = 10, X‾= 185, (c) n = 50, σ = 30, X‾ = 19.
a food scientist wishes to study the effect of the type of pan and amount of sodium bicarbonate used in preparing
find the indicated z score. the graph depict the standard normal distrubiton of blood count scores with mean of 0 and
If you want to determine whether the number of hours spent in a class was related to exam grades for stats students, which statistical test would you use?
an insurance company knows that in the entire population of millions of homeowners the mean annual loss from fire is
determine the p-value in each case and decide whether at the 5 significance level the data provide sufficient eveidence
Classify the following as an example of nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level: Gender of employees at a local warehouse.
Is it reasonable to conclude that this set of n = 16 people is not a representative random sample of registered voters?
Marks on statistics midterm test are normally distributed with mean of 78 and a standard deviation of 6. Determine the probability that class of 50 has average midterm mark that is less than 75?
Rivets used to secure the stainless steel sheet metal of aircraft wings are designed to withstand certain shearing forces. It is knownthat because of random variations in location the load on a rivet is Weibull distributed with a scale parameter of 7..
Is there sufficient evidence at a = 0.05 to conclude that the students did better the second time? Discuss possible reasons for your results.
Construct appropriate control charts and comment on the performance level. What are the chances of meeting a goal of no more than a 10-minute delay?
find the range standard deviation and variance for the following sample data2 11 81 29 22 59 78 71 21 43 99 12 38 74 56
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