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Tracking a ballistic missile with normal distribution measurement error. Estimate the value of ssa that gives smallest tracking error.
Suppose that incoming lots are 0.5% nonconforming. What is the probability of rejecting these lots under both plans?
Assume you are using a significance level of ?=0.05 to test the claim that ?<10 and that your sample is a random sample of 34 values. Find ?, the probability of making a type II error (failing to
A recent survey showed that among 850 randomly selected subjects who completed 4 years of college, 183 smoke and 667 do not smoke. Determine a 95% confidence interval for the true proportion of the
A survey of 1305 people who took trips revealed that 96 of them included a visit to a theme park. Based on those survey results, a management consultant claims that less than 8 % of trips include a
A newspaper conducted a statewide survey concerning the 1998 race for state senator. The newspaper took a SRS of n=1200 registered voters and found that 620 would vote for the Republican candidate.
Dylan wants to determine a 80 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must he have to ge
Barna Research group collected data showing church attendance by age group (USA Today, November 20, 2003). Use the sample data to determine whether attending church is independent of age. Use a 0.05
The operator of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. Assume that the standard deviation of this assembly tim
There seems to be evidence that the patients taking the antidepressant drug have a different success rate of not smoking after one year than the placebo group.
At the .100 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales? Hint: For the calculations, assume the Reduced price as the first sample.
A candy maker produces mints that have label weight of 20 grams on each box. Assume that the weight of a box of mints is normally distributed with a standard deviation of 0.4 grams. Determine the sa
Find the probability that at least one donation will be obtained. Find the probability that between one and three donations inclusive will be obtained.
Before bidding on a contract, a contractor wants to be 90% confident that he is in error by less than 20 minutes in estimating the average time it takes a certain kind of cement to dry. If the stand
If the sample were repeated many times, what would be the range of the sample proportions of mobile subscribers who have texted, according to the 95 part of the 68-95-99.7 rule?
Conduct a hypothesis test to determine if the proportion of business students at Bayview University who were involved in some form of cheating is less than that of nonbusiness students at other inst
Samples of final examination scores for two statistics classes with different instructors provided the following results: for instructor "A" the sample size was 12, the sample mean score was 72 and
If sample data result in a linear correlation coefficient of r = 0.400, what proportion of the variation in y is explained by the linear relationship between x and y?
What is the final conclusion obtained when testing the claim that p > 0.25, given that the P-value is 0.5555?
The table summarizes data on smoking status and perceived risk of smoking and is consistent with summary quantities obtained in a Gallup Poll conducted in November 2002. Assume that it is reasonable
Discuss why the F-test and not the t-test is used in conducting the global test of coefficient in a multiple regression model. Identify the problem that would occur if you utilized the t-test, rathe
As the population ages, there is increasing concern about the accident-related injuries to the elderly. The article "Age and Gender Differences in Single-Step Recovery from a Forward Fall" reported
It is desired that the true standard deviation of the softening point of a certain type of petroleum pitch be at most 0.50 degrees celsius. The softening points of ten different specimens were deter
Test the claim that the population of kindergarden students has a mean grade point average of 2.25 versus a mean grade point average greater than 2.25. Sample statistics include n=71, x??=2.4, and s
The manufacturer wants to check that the mean length of their bolts is 160 mm, and so takes a sample of 50 bolts and uses a one tail test with ? = .01 (i.e. H0: µ ? 160). What is the probabili