Statistics Questions & Answers

Part 7 of 7 Is there agreement between the hypothesis test and the confidence interval? (Choose one) \( \mathbf{\nabla} \), there (Choose one) \( \boldsymbol{\nabla} \) agreement between the hypothesis test and the confidence interval because the Contidence interval (Choose one) \( \boldsymbol{\nabla} \) contain the hypothesized population proportion of \( 68.9 \% \). Continue

Prison Time According to a public service website, \( 68.9 \% \) of white collar criminals get prison time. A randomly selected sample of 156 white collar criminals revealed that 121 were serving or had served prison time. Using \( \alpha=0.01 \), test the conjecture that the proportion of white collar criminals serving prison time differs from \( 68.9 \% \) using a hypothesis test and a confidence interval.

¿Que tun seando dote ser la muastra para astimor el ingrese promedio de lue egresados dentro del mas menos \( \pm \$ 500 \) dolares y cun un nivel de confianza del \( 95 \% \) ?

Interstate Speeds It has been reported that the standard deviation of the speeds of drivers on Interstate 75 near Findlay, Ohio, is 8 miles per hour for all vehicles. A driver feels from experience that this is very low. A survey is conducted, and for 25 drivers the standard deviation is 8.1 miles per hour. At \( \alpha=0.10 \), is the driver correct? Assume the variable is normally distributed. Part: \( 0 / 5 \)

Cost of Rolex Watches The average cost of a Rolex watch is \( \$ 7521 \). A researcher selected a random sample of 40 jewelry stores and found the average cost of Rolex watches was \( \$ 7331 \). If \( \sigma=\$ 79 \) and \( \alpha=0.05 \), can it be concluded that the average cost of a Rolex watch in that area is less than \( \$ 7521 \) ? Part: \( 0 / 5 \)

Part 5 of 5 (e) Summarize the results. There is \( \begin{array}{l}\text { (Choose one) } \\ \text { enough evidence to support the claim } \\ \text { not enough evidence to support the claim } \\ \text { enough evidence to reject the claim } \\ \text { not enough evidence to reject the claim }\end{array} \)

Cigarette Smoking A researcher found that a cigarette smoker smokes on average 30 cigarettes a day. She feels that this average is too low. She selected a random sample of 8 smokers and found that the mean number of cigarettes they smoked per day was 32 . The sample standard deviation was 2.8 . At \( \alpha=0.05 \), is there enough evidence to support her claim? Assume that the population is approximately normally distributed. Use the critical value method and tables. Part: \( \mathbf{0} / \mathbf{5} \) Part \( \mathbf{1} \) of 5 (a) State the hypotheses and identify the claim.

Mean proportion (3) 7,28

11) At a water bottling facility, a technician is testing a bottle filling machine that is supposed to deliver 500 milliliters of water. The technician dispenses 38 samples of water and determines the volume of each sample. The 38 samples have a mean volume of \( \bar{x}=501.3 \mathrm{~mL} \). The machine is out of calibration if the mean volume differs from 500 mL .

SELECCIONA LA RESPUESTA CORRECTA. 1. Se realiza una auditoria de historias clínicas tomando una primeria historia al azar y después sucesivamente, la que ocupa la vigésima posición detrás de la anterior. Este procedimiento de muestreo se denomina: (a) Por conglomerados (b) Sistemático (c) Correlativo (d) Aleatorio simple (e) Estratificado 2. Se realiza un estudio con objeto de determinar el tiempo de supervivencia en pacientes con cáncer. Para ello de los dos hospitales existentes en una ciudad, se selecciona aleatoriamente uno de ellos, y se elige una muestra aleatoria de pacientes, atendiendo al tipo de cáncer. El muestreo realizado es: (a) Sistemático (b) Aleatorio (e) Por conglomerados y estratificado (c) Por conglomerados (d) Estratificado 3. Se desea estimar confidencialmente el número medio de veces que asiste a un servicio de salud los individuos de una población. Para ello se toman muestras aleatorias entre los individuos que asisten regularmente a los mismos. Esta técnica de muestreo es: (a) Un muestreo aleatorio simple. (b) Un muestreo aleatorio estratificado. (c) Un muestreo aleatorio por conglomerados. (d) Incorrecta. (e) Ninguna de las anteriores.