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The claim that the proportion of adults who smoked a cigarette in the past week is less than .30, and the sample statistics include n=1093 subjects with 350 saying that they smoked a cigarette in the past week. Find the falue of the test statistic.
A manufacturer claims that the mean lifetime, mu, of its light bulbs is 44 months. The standard deviation of these lifetimes is 7 months. Seventy bulbs are selected at random, and their mean lifetime is found to be 43 months.
the research team to identify if accounts with larger balances consistently take advantage of their additional services. Formulate a hypothesis statement regarding our research issue.
Joan's nursery specializes in custom-designed landscaping for residential areas. the estimated labour cost associated with a particular landscaping proposal is based on the number of plantings of trees,shrubs and so on to be used for the project.
a professor would like to utilize the normal distribution to assign grades such that 5 of students receive as. if the
Find a 99% confidence interval for the population mean number of weekly miles.
Estimate the difference in mean travelling time to campus by taxi and bus by constructing a 90% confidence interval.
The following frequency distribution reports electricity cost for sample of 50 two-bedroom apartments in Albuquerque, New Mexico during the month of May last year.
car sales in the current month 18830 toyota camry cars were sold and there were 18341 honda civic cars soldprovide two
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6 mg/L. For 26 younger men the sample standard dev..
Construct a 95% confidence interval for the mean monthly rent of all advertised one-bedroom apartments. A 95% confidence interval for the mean monthly rent is?
professor green gives two-month computer programming courses during the summer term. students must pass a number of
A statistics professor plans classes so carefully that the lenths of her class are uniformly distributed between 50.0 and 52.0 minutes. Find the probability that a given class period runs less than 51.5.
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