Sample of the population; generalizations about a population from a sample are valid only if the sample is representative of that population. Understand that random sampling
tends to produce representative samples and support valid inferences.
A statistics student samples a group of people to determine the probability that a student
Lakeview High owns a car. Which group of people should the student survey to provide the
most accurate sample?
A
B
a fourth of the students in each grade at Lakeview High
all the students in the freshman class at Lakeview High
the members of the JV basketball team
с
D the students at the statistics student's lunch table
7.SP.2: Use data from a random sample to draw inferences about a population with an

Item 1 solve for s. s+24=90 −114 −66 66 114

Amanufacturing firm has been averaging 16.8 orders per week for several years. however, during a recession, orders appeared to slow. suppose the firm’s production manager randomly samples 31 weeks and finds an average of 15.6 orders with a standard deviation of 2.3 orders. using a 0.025 significance level, test whether the mean number of orders has decreased. type the full 5 step procedure into the answer box, then for multiple choice practice, answer the following: 1. what is the name and symbol of the parameter that you are testing? 2. what is the symbol and value of the point estimate of that parameter? 3. what distribution are you using to test this parameter? 4. what is the critical value? 5. what is the test statistic value? 6. what is the p-value?

Find two numbers if their ratio is 4: 7 and their difference is 123.