Test
0MIS 41
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Preguntas del test (18)
1When we are interested in means, variances and proportions for populations, we are talking about
- AStatistics
- BParamaters
- CNone of these answers
- DInferences
2Making conclusions about population parameters based on sample statistics is known as
- Adescriptive statistics
- Bnone of these answers
- Cquantitative statistics
- Dinferential statistics
3A point estimate is defined as
- Aa single value that is the best estimate of an unknown population parameter
- Ba single value that is the best estimate of an unknown sample statistic
- Cthe proportion of the sample values
- Dthe average of the population values
4Find the value of the right-tail standard normal random variable Z for α = 10%
- A2.33
- B1.28
- C1.645
- D1.96
5The letter α in the formula for constructing a confidence interval estimate of the population mean is
- Athe probability that a confidence interval will not capture the population mean
- Bthe area in the lower tail of the sampling distribution of the sample mean
- Cthe probability that a confidence interval will capture the population mean
- Dthe level of confidence
6The letter α in the formula for constructing a confidence interval estimate of the population mean is
- Athe probability that a confidence interval will not capture the population mean
- Bthe area in the lower tail of the sampling distribution of the sample mean
- Cthe probability that a confidence interval will capture the population mean
- Dthe level of confidence
7A random sample of 10 waitresses at a Santa Clara restaurant revealed the following hourly earnings (including tips): 19, 18, 15, 16, 18, 17, 16, 18, 20, and 14.
If the hourly earnings are normally distributed with a standard deviation of $4.50, estimate with 95% confidence the mean hourly earnings for all waitresses in Santa Clara.- A(13.78, 20.42)
- B (16.65, 17.55)
- C(14.31, 19.89)
- Dnone of these answers
8How do you interpret the above confidence interval
- A95% of the data will fall within the confidence interval
- Bif we repeatedly draw samples of the same size from the same population, 95% of the intervals we create in this fashion will capture the true population mean
- Cwe are 95% confident that 5% of the values of the sample means will result in a confidence interval that includes the population mean
- Dwe are 95% confident that we have selected a sample whose range of values does not contain the population mean
9How large a sample of state employees should be taken if we want to estimate with 95% confidence the mean salary to within $2000? The population standard deviation is assumed to be $10,500.
- A74.58
- B105.88
- Cnone of these answers
- D1106.00
10A Type II error is committed if we make
- Aan incorrect decision when the null hypothesis is false
- Ban incorrect decision when the null hypothesis is true
- Can incorrect decision when the alternative hypothesis is true
- Dan incorrect decision when the alternative hypothesis is false
11The criterion always used to determine the appropriate null and alternative hypotheses is
- Athe probability of a Type II error must be less than the probability of a Type I error
- Bthe most expensive error should be Type II
- Cthe most expensive error should be Type I
- D the probability of a Type I error must be less than the probability of a Type II error
12 A semiconductor company is planning to release a new product that will revolutionize the pacemaker industry if it works as advertised by the company. However, the product could result in fatalities if it malfunctions. What null and alternative hypotheses should the company use when testing the effectiveness of this new product
- AH0:The pacemaker is not effective and is not ready to be marketed to the general public.
H1:The pacemaker is effective and should be made available to the general public - BH0:The pacemaker is effective and is ready to be marketed to the general public.
H1:The pacemaker is not effective and should not be made available to the general public - CH0:The pacemaker is not effective but is ready to be marketed to the general public. H1:The pacemaker is effective but should not be made available to the general public
- DH0:The pacemaker is effective but is not ready to be marketed to the general public. H1:The pacemaker is not effective but should be made available to the general public
- AH0:The pacemaker is not effective and is not ready to be marketed to the general public.
13We want to test the hypothesis H0: μ = 125, H1: μ > 125, given n = 250, σ = 40, α = 10% and X-bar = 130. Answer the following six questions as they relate to this scenario
In X-space, what is the rejection region- AX-bar > X-barcrit = 121.8
- BX-bar > X-barcrit = 129.2
- CX-bar > X-barcrit = 125.2
- DX-bar > X-barcrit = 128.2
14We want to test the hypothesis H0: μ = 125, H1: μ > 125, given n = 250, σ = 40, α = 10% and X-bar = 130. Answer the following six questions as they relate to this scenario
The calculated value of X-bar is- A40
- B125
- Cnone of these answers
- D130
15We want to test the hypothesis H0: μ = 125, H1: μ > 125, given n = 250, σ = 40, α = 10% and X-bar = 130. Answer the following six questions as they relate to this scenario
In Z-space, what is the rejection region- AZ > Zcrit = 1.645
- BZ > Zcrit = 1.28
- Cnone of these answers
- DZ < Zcrit = -1.28
16We want to test the hypothesis H0: μ = 125, H1: μ > 125, given n = 250, σ = 40, α = 10% and X-bar = 130. Answer the following six questions as they relate to this scenario
In Z-space, what is the calculated value- A1.38
- B1.98
- C1.76
- Dnone of these answers
17We want to test the hypothesis H0: μ = 125, H1: μ > 125, given n = 250, σ = 40, α = 10% and X-bar = 130. Answer the following six questions as they relate to this scenario
What is the p-value- A.012
- B-2.33
- C.009
- D.024
18We want to test the hypothesis H0: μ = 125, H1: μ > 125, given n = 250, σ = 40, α = 10% and X-bar = 130. Answer the following six questions as they relate to this scenario
What conclusion do we reach?- ADo not reject the null because X-barcalc > X-barcrit
- BReject the null because p-value < α
- CAll of these answers
- DReject the null because Zcalc < Zcrit
Información
- Descripción
- OMIS Test sobre 0MIS 41, creado por hsherwood02 el 08/02/2014.
- Autor
- hsherwood02
- Idioma
- English
- Visitas
- 54
- Historial
- Creado el 8 feb 2014 · actualizado el 19 feb 2016
- Etiquetas
- Valoración
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