STATISTICS MILESTONE 5 EXAM WITH CORRECT ANSWERS AND VERIFIED QUESTIONS GRADED A+

STATISTICS MILESTONE 5 EXAM 2024- 2025 WITH CORRECT ANSWERS AND VERIFIED QUESTIONS GRADED A+ Edwin conducted a survey to find the percentage of people in an area who smoked regularly. He defined the label "smoking regularly" for males smoking 30 or more cigarettes in a day and for females smoking 20 or more. Out of 635 persons who took part in the survey, 71 are labeled as people who smoke regularly. What is the standard error for the sample proportion? Answer choices are rounded to the thousandths place. - ANS-0.013 Sukie interviewed 125 employees at her company and discovered that 21 of them planned to take an extended vacation next year. She finds that the proportion of people taking extended vacations nationally is 15%. The z statistic for this data is __________. - ANS-0.56 What do the symbols , , and represent? - ANS-Sample statistics A table represents the number of students who passed or failed an aptitude test at two different campuses. East CampusWest CampusPassed4837Failed5263 In order to determine if there is a significant difference between campuses and pass rate, the chi-square test for association and independence should be performed. What is the expected frequency of West Campus and failed? - ANS-57.5 students The data below shows the grams of fat for a variety of snacks. Morris wants to calculate the standard error of the sample mean for this set of data. SnackGrams of FatSnack 19Snack 213Snack 321Snack 430Snack 531Snack 631Snack 734Snack 825Snack 928Snack 1020 What is the standard error for this set of data? - ANS-2.63 The government claims that the average age of Californians is 34 years. Joe hypothesizes that the average age of the population of California is not equal to 34 years. He records a sample mean equal to 37 and states the hypothesis as μ = 34 vs μ ≠ 34. What type of test should Joe do? - ANS-Two-tailed test Henri has calculated a z-test statistic of -2.73. What is the p-value for this left-tailed test? Answer choices are rounded to the thousandths place. - ANS-0.003 Brad recorded the number of visitors at the local science museum during the week: DayVisitorsTuesday18Wednesday24Thursday28Friday30 He expected to see 25 visitors each day. To answer whether the number of visitors follows a uniform distribution, a chi-square test for goodness of fit should be performed. (alpha = 0.10) What is the chi-squared test statistic? Answers are rounded to the nearest hundredth. - ANS-3.36 Select the false statement about ANOVA. - ANS-If a researcher wants to compare the mean wages of females in different age groups at a particular company, he or she should not use an ANOVA because the population means are unknown. One condition for performing a hypothesis test is that the observations are independent. Mary is going to take a sample from a population of 500 students. How many students will Mary have to sample without replacement to treat the observations as independent? - ANS-50 The table below shows the results of a customer satisfaction survey at a particular restaurant broken down by males and females. MaleFemaleExtremely Satisfied257Satisfied2113Neutral1316Dissatisfied914Extremely Dissatisfied25 Assuming all 5 choices are equally likely, select the observed and expected frequency for male customers that are dissatisfied. - ANS-Observed: 9 Expected: 14 Rachel measured the lengths of a random sample of 100 screws. The mean length was 2.9 inches, and the population standard deviation is 0.1 inch. To see if the batch of screws has a significantly different mean length from 3 inches, what would the value of the z-test statistic be? - ANS--10 A researcher has a table of data with 5 column variables and 5 row variables. The value for the degrees of freedom in order to calculate the statistic is __________. - ANS-16 Adam tabulated the values for the average speed on each day of his road trip as 60.5, 63.2, 54.7, 51.6, 72.3, 70.7, 67.2, and 65.4 mph. If Adam wanted to construct a one-sample t-statistic, what would the value for the degrees of freedom be? - ANS-7 Mrs. Pellegrin has weighed 5 packages of cheese and recorded the weights as 10.2 oz, 10.5 oz, 9.3 oz, 9.8 oz, and 10.0 oz. She calculated the standard deviation to be 0.45 oz. The cheese factory lists the package weight at 10 oz. The t-statistic for a two-sided test would be __________. - ANS--0.20 The manager of a mall conducted a survey among two groups (n1 = 100, n2 = 100) of visitors to the mall on different days. She found that the first group spent an average of 60 minutes in the mall, while the second group spent an average of 90 minutes in the mall. If the manager wishes to see the difference in the average times spent by the two groups in the mall, which of the following sets shows the null hypothesis and alternative hypothesis? - ANS-Null Hypothesis: There is no difference in the average times spent by the two groups in the mall.Alternative Hypothesis: There is at least some difference in the average times spent by the two groups in the mall.