checking answers

(1) determine whether the value is a parameter or statistic.

43.87% of voters turned out for the 2004 elections.

Statistic

Parameter

(2) In a study, the data you collect is wage per hour.

This data is?

Quantitative

Qualitative

(3) In a study, the data you collect is habits on an Always/Sometimes/Never scale.

What type of data is this?

Qualitative (categorical)

Quantitative

(7) A group of people was asked if they had run a red light in the last year.

222 responded "yes",and 230 responded "no".

Find the probability that if a person is chosen at random, they have run

a red light in the last year.

(10) Using the Binomial distribution

If n=9 and p=0.7, find P(x=6)

(11) A regression was run to determine if there is a relationship between hours of TV watched

per day (x) and the number of sit-ups a person can do (y).

The results of the regression were:y=ax+ba=-1.075 b=35.805 r2=0.613089 r=-0.783.

Use this to predict the number of situps a person who watches 8 hours of TV can do

(to one decimal place).

(18) If a seed is planted, it has a 60% chance of growing into a healthy plant.

if 7 seeds are planted what is the probability that exactly 1 doesn't grow?

(21) Assume that a sample is used to estimate a population proportion p. Find the margin of error

M.E. that corresponds to a sample of size 280 with 17.1% successes at a confidence level of

95%.

M.E. = %

Report answer accurate to one decimal place (as a number of percentage points). The answer should be obtained without any preliminary rounding (however, the critical value may be rounded to 3 decimal places).

Confidence Level z*- value

80% 1.28

85% 1.44

90% 1.64

95% 1.96

98% 2.33

99% 2.58

(24) The time it takes me to wash the dishes is uniformly distributed between 7 minutes and 14

minutes. What is the probability that washing dishes tonight will take me between 9 and 12

Minutes?

Give your answer accurate to two decimal places.