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According to the Center for Disease Control (CDC), 49.4% of American adults 18 years old and over meet their Physical Activity Guidelines for aerobic physical activity. The owners of a gym want to know if the proportion of their members who meet these requirements is different from the national proportion given by CDC. They take a random sample of 40 members and 28 meet the CDC's guidelines. At 1 % level of significance, is there sufficient evidence that the proportion of their members who meet these requirements is different from the national proportion given by CDC? (Define the parameter of interest, state the null and alternative hypotheses, compute the value of the test statistic and the p-value, state your decision and give the conclusion in the context of the study)
an inspector obtains four samples with three observations in each. the actual measurements in centimeters are shown
a student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. she pulls
the moisture x of the wet mix of a product is considered to have an effect on the density y of the finished product.
the following data represent the responses y for yes and n for no from a sample of 40 college students to the question
a telephone survey commissioned by the new zealand health service found that 16 of new zealanders consume more than 10
suppose a hypertension trial is mounted and 18 participants are randomly assigned to one of three comparison
The probability that home sales will increase in the next 6 months is 0.25. The probability that the interest rates on loans will go up in the same period is estimated to be 0.74.
a government agency uses a few new scooters for each model every year to collect data on the pollution emission and
the random variable x has a density functionfx 4xe-2x if 0 lt x lt infinity 0 otherwisecompute the variance of
Students will conduct one brief research exercise that will be written up as a research report using APA style.
A pH level of the soil between 5.3 and 6.5 is optimal for strawberries. To measure the pH level, a field is divided into two lots. In each lot, we randomly select 20 samples of soil.
What is the standard error of estimate? Describe with an example. What are the coefficients of the linear regression model and what do they mean? What are the various statistics reported in a regression output?
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