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Q1) Assume that newspaper conducts survey of random sample of 120 registered voters to predict winner of a local election. Republican candidate was favoured by 62 of the respondents.
Create and interpret a 99% confidence interval for π, true proportion of voters who favour Republican candidate.
Q2) A random sample of houses in LA is chosen and level of radon gas is measured for each house in sample. Values gathered are given below in parts per million (ppm.) Experience has shown that radon gas level is approximately normally distributed for this population.
5,4,8,13,6,7,3,9,8,4,11,8
Create the 95% confidence interval for μ.
Test the hypothesis. Will you reject or not reject the null hypothesis at α = 0.05
A case-control study of relationship between liver cirrhosis among both non alcoholics and alcoholics. Describe whether smoking is confounder.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
A recent study of the Greater Los Angeles Taxi Driver Association demonstrated that the average or media tariff that they charge from Hermosa Beach to the International Airport of Los Angeles is $18.00
What is the probability that a cereal would be high calorie, given that it is high fiber? In other words, what is P (high calorie, given high fiber)?
Complete the test at the 5% level of significance.
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
Mention the critical value of test statistic (Or give the p-value of the test.)
Change the frequencies to percentages - is there a group more likely to get high salaries.
What percent of sales representatives earn more than $42,000 per year?
To find out the proportion of the population of likely voters who agree the statement. Could we say among appropriate statistical certainty which the proportion of the population of likely voters.
If the standard deviation of the amount of coffee dispensed is 0.4oz and the amount of coffee dispensed is normally distributed.
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