It is believed that 25% of U. S. homes have a direct satellite television receiver. (Show your work on the back for both parts, since I have not left you enough space, but enter your answer here.) a. How large a sample is necessary to estimate the true population of homes which do with 95% confidence and within 3 percentage points?

b. How large a sample is necessary for a 95% confidence interval to be within 3 percentage points if nothing is known about the proportion?

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed

Run a linear regression to determine an equation (y=mx+b y=mx+b)

How to do a maths question? i have a mock