Alina measured a distance to be 2.18 miles. what is the margin of error?
2.175 miles to 2.185 miles
2.185 miles to 2.195 miles
2.1 miles to 2.2 miles
2.2 miles to 2.3 cm

Which linear inequality is represented by the graph?

Anyone know these questions? i need ,.

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.