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F - STAT 200 - 013/014 - BASIC STATISTICAL PRACTICE Esther Benitez 10/05/24 6:44 PM Exam 1 Question 16 of 33 This test: 33 point(s) possible This question: 1 point(s) possible Resume later Submit test estion list Question 12 Question 13 Question 14 Question 15 Question 16 An article in a reputable journal discussed several data collection methods for testing the efficacy of a new program designed to reduce drug-related crimes in a city. The sample consisted of 56 "hot spots"-areas of the city with a high crime rate but not necessarily a high drug crime rate. In Method 1, the new program will be implemented in half of the 56 hot spots (selected at random); the othier half will not implement the program (the "no treatment" group). In Method 2, the 56 hot spots will be divided into four groups based on the level of drug crimes - very high drug crime rate ( 10 hot spots), high rate ( 8 hot spots), moderate rate ( 26 hot spots), and low rate ( 12 hot spots). In each group, half the hot spots will be randomly assigned the new crime prevention program and the other half no treatment. For both methods, after several weeks the crime rates in the hot spots where the program was implemented will be compared with those with no treatment. Complete parts a through d below. a. Identify the data collection method for Method 1. Choose the correct answer below. A. Random sample B. Published source C. Designed experiment D. Observational study b. Identify the data collection method for Method 2. Choose the correct answer below. A. Random sample
Todo nuevo empleado que ingresa a la ACHS es recibido el primer día por el presidente de la compañía. Es él quien hace la recepción y da a conocer los valores corporativos que como elemento primordial tiene el bienestar de sus empleados. A esta actividad le asignan una vital importancia para la identificación con la empresa. En la ACHS están seguros de que la preocupación por su personal se traduce finalmente en un mejor desempeño en el trabajo. Existe una preocupación permanente por ver las nuevas necesidades que van surgiendo entre los empleados, pero se preocupan de que la implementación de cualquier nuevo beneficio vaya acompañado de un sentido y así lo enfatizan en la gerencia ↔RR. HH. de la empresa. En términos de medición de resultados, junto con las variables económicas, incorporan otras como las que tienen que ver con la relación con el personal y específicamente lo que denominan ICAVI (Índice de calidad de vida) de los empleados. Además de métricas externas como la que les entrega Great Place to Work y el ranking de Mejores Empresas para Madres y Padres que Trabajan, tienen un instrumento interno que se llama Balance Social. Se trata de una encuesta anual cuyo objetivo es determinar la calidad de los beneficios que se están entregando y el clima laboral. Sobre la base de los resultados de dicha encuesta y de las sugerencias que plantean los empleados, se realiza un diagnóstico a partir del cual se elabora el "Plan Social" para el año siguiente. En la ACHS tienen un bajo nivel de rotación y el tiempo de permanencia en la empresa
A study examined whether the content of TV shows influenced the ability of viewers to recall brand names of items featured in the commercials. Analysts recorded the number of advertised brand names a group of people recalled immediately after watching TV shows and then that same group of people recalled 24 hours later. Strangely enough, it appears that they remembered more about the ads the next day. Should we conclude this is true in general about people's memory of TV ads? Complete parts a through d. c) How might the design of this experiment have tainted these results? A. Since the populations of each group are not normally distributed, subjects with high recall could skew the means for each group. B. Since the populations of each group are not normally distributed, a two-sample t-test is not appropriate to compare the means between the two groups. C. Since the subjects were not selected at random, the first interview might have helped the subjects with high recall to remember the brand names for a longer period of time than they would have otherwise. D. A subject with high recall right after the show might have high recall 24 hours later as well. Also, the first interview might have helped the subjects to remember the brand names for a longer period of time than they would have otherwise. d) Suggest a design that could compare immediate brand name recall with recall one day later. A. Randomly assign half of the group watching violent TV shows to be interviewed immediately after watching, while the other half of the group is interviewed 24 hours later. B. Assign the older half of the group watching violent TV shows to be interviewed immediately after watching, while the younger half of the group is interviewed 24 hours later. C. Assign subjects in the group with horrible short-term memory to be interviewed immediately after watching the violent TV show, and assign subjects with horrible long-term memory to be interviewed 24 hours later. D. Assign subjects in the group with good short-term memory to be interviewed immediately after watching the violent TV show, and assign subjects with good long-term memory to be interviewed 24 hours later.