1. A city is divided in 10 districts. The real estate agent has to select sample of single home houses for study which can be used to develop equation for appraised value of the properties from age of building, size, number of bathrooms, number of bedrooms, distance to nearest scool and taxes on property. What type of research is that qualitative or quantitative? Explain.

2. A company samples the distribution of conductivity in isolation of receptacles and got the following values:

24.4625.6126.2526.4226.6627.1527.3127.5427.7427.9427.9828.0428.2828.4928.5028.87 29.11 29.13 29.50 30.88

Trimming 10% mean when we discard the smallest and largest 10 % of the sample. Can we use that sample for to calculate the point estimate of population mean? What are the values for estimator of population mean with and without trim? Provide full reasoning.

3.You are the manager of a company has to prepare report about sales in 100 geographically distributed stores. What he want to know what are 5 most popular items each of the stores sales. How you are going to solve the problem. Explain fully your decision making process.

4. The width of CI 95% is 0.258. Calculate what is the value of to ensure a width of 0.1 Take the most conservative estimation of . Note that 95% CI is 1.96.