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The weights of new born baby girls born at a local hospital are normally distributed with the standard deviation of 10 ounces. A hospital administrator conducts a study to determine whether the mean weight of all newborn girls born at the hospital is less than 110 ounces. A random sample of size n = 20 had a mean weight of 106 oz. State Ho and H1 hypothesis , find critical value at significance level a= 0.01, make a decision.
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. What is the standard deviation for the sample proportion?
Has anything changed between 1936 and now that would make you believe that the approach used by the Literary Digest would work better today?
A study by Peter D. Hart Research Associates for the Nasdaq Stock Market revealed that 43% of all American adults are stockholders.
Exam: 250712RR- Create a new experiment consisting of repeating the original experiment 3 times. Assume each repetition is independent of the others. What is the probability of three successes?
The mean math score for fifth grade students at Smart Elementary is 90 with a standard deviation of 8. The fifth grade students are tested each year to determine if the mean score remains the same.
let x be the damage incurred in in a certain type of accident during a given year. possible x values are 0 1000 5000
Construct a 95% confidence interval for the proportion of all programmers in the population from which the sample was selected who prefer Java.
The average gasoline price of one of the major oil companies in Europe has been $1.25 per liter. Recently, the company has undertaken several efficiency measures in order to reduce prices.
assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of 2225
Describe a where you might want to use a dummy variable in a multiple regression. What would the dummy variable buy you in that situation?
Determine a 95 % confidence interval for the iron concentration.
In a code division multiple access (CDMA) communications system, k users share a radio channel using a set of n-dimensional code vectors {S1,..., Sk} to distinguish their signals.
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