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Q1) A major credit card company has find out that its customers charge average of $ 280 per month on their accounts with standard deviation o f$20
i) What percentage of customers charges more than $275 per month?
ii) What percentage of customers charges more than $43 per month?
iii) What percentage of customers charges more than $241 an d$301.60 per month?
Q2) A manufacturing process makes items whose weights are normally distributed. It is known that 22.57% of all the items made weigh between 100 grams up to mean and 49.18% weigh from the mean up to 190 grams
a) Find out the mean.
b) Find out the standard deviation.
They are thinking of introducing a new flavour, maple-marshmallow Frumpies, and want to know whether children will prefer the new flavour to the old one. Design a completely randomized experiment to investigate this question.
Write down the advantages and disadvantages of using computer software for decision making.
Assuming that these are a random sample of all publicly traded companies, construct a 95 % confidence interval for the overall noncompliance proportion.
Determine the probability that Mexican American male in the 20 -74 age range has serum cholesterol value greater than 240 mg/dl.
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
Finding the value of test statistic utilizing two-tail 't' test also interpret the result. The Commercial Bank as well as Trust Company is studying the use of its automatic teller machines.
Categorize the following as discrete or continuous random variables.
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
From past data, it is recognized that company's production process results in normally distributed yield strengths. Test company's claim at a = 0.05.
Assume that Los Arboles had a special program in place to encourage helmet use. Elucidate to what extent did removal of the outlier improve the fit.
Find the t c for a 90% confidence level with a sample size of 18.
Calculate the probability that the median of the sample or average medians is:
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