In March 2011, the Pew Research Center conducted a survey of US adults to determine whether higher education provides students with a good value compared to the cost. Pollsters randomly selected 2,142 adults ages 18 and older living in the continental US. A total of 1,052 interviews were completed with respondents contacted by landline telephone and 1,090 with those contacted on their cellular phone. Which feature of the sampling plan makes the sample representative of the population?

Group of answer choices

The reputable organization conducting the study (the Pew Research Center)

The large sample size of 2,142 adults

The random selection of adults

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?