Davenport University STAT 500 Quiz Help

Get help for Davenport-University STAT 500 Quiz Help. Determine whether the given value is a statistic or parameter. After inspecting all of 55,000 kg of meat stored in Worst Sausage Company, it was found that 45,000 kg of meat was spoiled. Determine whether the given value is a statistic or parameter. A sample of 120 employees of a company is selected, and the average age is found to be 37 years. Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Survey responses of “good”, “better”, “best”. Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. The subjects in which college students major. Identify the sample and population. Also, determine whether the sample is likely to be representative of the population. 100,00 randomly selected adults were asked whether they drink at least 48oz of water each day and only 45% said yes.

Identify which type of sampling method was used: A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers. Identify which sampling method is used: A market researcher selects 500 drivers under 30 years of age and 500 drivers over 30 years of age. Provide an appropriate response. An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and then interviews all of the teachers at the selected schools. Does this sampling plan result in a random sample? Provide an appropriate response. A polling company obtains an alphabetical list of of names of voters in a precinct. They select every 20th person from the list until a sample of 100 is obtained. They then call these 100 people. Does this sampling plan result in a random sample? The frequency distribution for the weekly incomes of part time students is given below.Construct the corresponding relative frequency distribution. Round relative frequencies to the nearest hundredth of a percent, if necessary.

Find the original data from the stem plot. Which of the following describes a histogram? 10 from a population with a known mean and standard deviation, what requirement, if any, must be satisfied in order to assume that the distribution of the sample means is a normal distribution? If z is a standard normal variable, find the probability. For a standard normal distribution, find the percentage of data that are more than 1 standard deviation away from the mean. Solve the problem. Round to the nearest tenth unless indicated otherwise. The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches? In one region, the September consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh.

If 50 different homes are randomly selected, find the probability that their mean energy consumption level for September is greater than 1075 kWh. True of False. The central limit theorem states that as the sample size increases, the distribution of sample means approaches a skewed distribution. Given the linear correlation coefficient r and the sample size n, determine the critical values of r. Use your finding to state whether or not the given r represents a significant linear correlation. A set of data consists of the number of years that applicants for foreign service jobs have studied German and the grades they received on a proficiency test. 10.9x, where x represents the number of years of study and y represents the grade on the test. What does the slope of the regression line represent in terms of a grade on the test? Find the value of the linear correlation coefficient r.

The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test. Select the appropriate conclusion based on the following result: There is no significant linear correlation between scores on a math test and scores on a verbal test. Use the given data to find the best predicted value of the response variable. Which of the following is NOT one of the most common sources or errors made in interpreting correlation results? Which of the following describes the coefficient of determination? Use the given information to find the coefficient of determination. A regression equation is obtained for a collection of paired data. Which of the following is a property of the linear correlation coefficient r? Use the computer display to answer the question. A collection of paired data consists of the number of years that students have studied Spanish and their scores on a Spanish language proficiency test. A computer program was used to obtain the least squares linear regression line and the computer output is shown below.