Travelers who have no intention of showing up often fail to cancel their hotel reservations in a timely manner.  These        travelers are known, in the parlance of the hospitality trade, as “no-shows”.  To protect against no-shows and late        cancellations, hotels invariably overbook rooms.  A recent study examined the problems of over-booking rooms in the hotel        industry.  The following data, extracted from the study represent the daily numbers of late cancellations and no-shows for a        random sample of 10 days at a hotel:     18, 16, 16, 16, 14, 18, 16, 18, 14, 19. c)    Count the number of measurements that actually fall within the interval(x¯−2s, x¯+2s){  and express the interval count as a percentage of total number of measurements

Seattle Grace Medical Center. As part of a long-term study of individuals 65 years of age or older, doctors at the Seattle Grace Medical Center in Washington state investigated the relationship between state of residence and depression. A sample of 60 individuals, all in reasonably good health, was selected; 20 individuals were residents of Texas, 20 were residents of Washington state, and 20 were residents of South Carolina. Each of the individuals sampled was given a standardized test to measure depression. The data collected follow; higher test scores indicate higher levels of depression. These data are contained in the attached data file SeattleGrace1. A second part of the study considered the relationship between state of residence and depression for individuals 65 years of age or older who had a chronic health condition such as diabetes and/or high blood pressure. A sample of 60 individuals with such conditions was identified. Again, 20 were residents of Texas, 20 were residents…

Applicants for temporary office work at Carter Temporary Help Agency who have successfully completed an administrative assistant course are then placed in suitable positions by Nancy Dwyer and Darla Newberg. Employers who hire temporary help through the agency return a card indicating satisfaction or dissatisfaction with the work performance of those hired. From past experience it is known that 75% of the employees placed by Nancy are rated as satisfactory, and 65% of those placed by Darla are rated as satisfactory. Darla places 60% of the temporary office help at the agency, and Nancy places the remaining 40%. If a Carter office worker is rated unsatisfactory, what is the probability that he or she was placed by Darla? (Round your answer to three decimal places.)

In a survey of 1220 adults in a​ country, 58​% said the​ country's leader should release all medical information that might affect their ability to serve. The study is   observational, an experiment, because it   applies does not apply a treatment to the adults.

Suppose you work as a manager for a large clothing store. You are considering introducing a loyalty program to encourage customers to spend more at your store. Before rolling out your program to the public, you want to do a small experiment to estimate its effectiveness. You offer the loyalty program to 10 random customers, and also observed the sales of 27 random customers who did not get the program as a control group. The customers that were part of the loyalty program had average monthly sales of $302.57 and a sample standard deviation of $49.73. For the control group, the customers had an average monthly sales of $231.65 and a sample standard deviation of $67.88. * Given a 95% confidence interval critical value of t = 2.04, what is the upper bound (upper end) of a 95% confidence interval for the difference between two averages? Use (μloyalty program no loyalty program) for the order. Note: 1- Only round your final answer. Round your final answer to two decimal places.

Some researchers have noted that adolescents who spend a lot of time playing video or computer games are at greater risk for depression and violence. This is an example of:   a. an observational study with lurking variables that may explain the association.   b. a paired data experiment, because we are studying both aggression and game playing.   c. a single-blind experiment, because the subjects knew they were playing games.   d. a valid conclusion, because more time yields more aggression is a positive association.

Suppose that you wanted to design an investigation that examined the association between energy drink consumption and social interaction. You select your sample population and begin making your observations. As the research progresses, you suspect that a number of the subjects exhibit behavioral changes simply related to their knowledge of being enrolled in the study and the increased attention they are receiving as subjects. This phenomenon is known as: Group of answer choices selection bias the Hawthorne effect healthy participant effect misclassification error the Rosenthal effect

(a) The Columbus Zoo conducts a study to determine whether a household's income can be used to predict the amount of money the household will give to the zoo's annual fund drive. The response variable in this study is A. all households in Columbus. B. the Columbus Zoo. C. a household's income. D. the amount of money a household gives to the zoo's annual fund drive. E. None of the above. (b) A researcher wishes to determine whether the rate of water flow (in liters per second) over an experimental soil bed can be used to predict the amount of soil washed away (in kilograms). In this study, the explanatory variable is the A. rate of water flow. B. amount of eroded soil. C. depth of the soil bed. D. size of the soil bed. E. None of the above. (c) A researcher measures the correlation between two variables. This correlation tells us A. whether or not a scatterplot shows an interesting pattern. B. the strength of a straight line relation between two variables. C. whether a cause-and-effect…

Suppose that a consultant is helping the owner of a local jewelry store set prices for a sale. The owner is considering applying a discount to its most popular engagement ring, currently priced at $1500. The consultant wants to determine if the average amount consumers spend on similar engagement rings is more than $1500. To do this, she selects a random sample of 15 other jewelry stores in the area and records the prices of engagement rings with a similar style, cut, and weight. The prices of these rings are shown below. $1400, $1230, $1450, $1175, $1850, $1060, $1390, $1260, $2850, $1580, $1500, $1850, $1770, $1400, $1775 Using this sample data, she calculates a mean of $1569.33 and a standard deviation of $432.16 and plans to use this information to conduct a one-sample t-test of Ho μ = $1500 against H₁ μ> $1500. Is this an appropriate use of a one-sample t-test? No, because the sample contains an outlier. Yes, because the population is normally distributed. Yes, because the data…

The Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to full-service restaurant chains (Consumer Reports website). One of the variables in the study is meal price, the average amount paid per person for dinner and drinks, minus the tip. Suppose a reporter for the Sun Coast Times thought that it would be of interest to her readers to conduct a similar study for restaurants located on the Grand Strand section in Myrtle Beach, South Carolina. The reporter selected a sample of 8 seafood restaurants, 8 Italian restaurants, and 8 steakhouses. The following data show the meal prices ($) obtained for the 24 restaurants sampled. Use a = 0.05 to test whether there is a significant difference among the mean meal price for the three types of restaurants. Source Sum of Squares Degrees Mean Square F P-value of Variation (to whole number) of Freedom (to 2 decimals) (to 2 decimals) (to 4 decimals) X X (X) * X * * Treatments Error Total The p-value is less than 0.01…