question

(i) A point estimate of the proportion of brick veneer properties in the population.

(ii) A 99% confidence interval estimate of the proportion of brick veneer properties in the population.

(b) Using the following formula: (sample statistic) (critical z or t) (standard error of the sample statistic)

Use the rule of thumb for good normal approximation for proportion, then the Empirical Rule for a Normal distribution to determine a 95% confidence interval estimate of the proportion of brick veneer properties in the population.

(c) Compare, in terms of the precision, the interval manually calculated in

(b) with the interval obtained from the Descriptive Statistics table in

(a). Explain why the direction of the change in precision is expected.

building Type( 0=nbv,1=br Mean 0.46 Standard Error 0.07120 Median O Mode 0 Standard Deviation 0.50346 Sample Variance 0.25347 Kurtosis -2.0566 Skewness 0.165523 Range Minimum 0 Maximum 1 Sum 23 Count 50 Confidence Level(99%) 0.190812