Statıstıcs II (ENG)
Ünite Sınavı Soruları
- 20 soru
- Soru metinleri açık; şıklar ve cevap anahtarı uygulamada
- 1
I. The probability distribution of the statistic is called its sampling distribution
II. The observations are selected randomly from the population
III. In a sample, observations are selected deliberately in order to manipulate the estimation
Which of the above are true about the features of point estimation?
- 2
How many different samples of size two can be created from this population with 6 students when the sample size is 3?
- 3
There are 5 Aegean big fishes, 12 Aegean medium fishes, 19 Aegean small fishes, 9 Mediterranean big fishes, 16 Mediterranean medium fishes, and 23 Mediterranean small fishes in an aquarium. What is the population proportion estimate of big fishes in this aquarium?
- 4
Interval estimation : the limits of the confidence interval are (0.41, 0.97), the significance level is 0.01. What is the sample arithmetic mean?
- 5
Interval estimation : the limits of the confidence interval are (4.1, 5.9), the significance level is 0.05. What is the sample arithmetic mean?
- 6
In a population there are 5 observations as follows: 10, 90, 20, 80, 50. What is the arithmetic mean of the sampling distribution of the sample mean for all the samples with the size 2?
- 7
Sample values for a continuous variable are as follows (noise level of a laptop computer ; as decibel) : 16, 19, 23, 24, 27, 32, 17, and 10. What is the point estimate of the population arithmetic mean?
- 8
If a sample proportion of a variable in an investigation is 42%, then what is the point estimate of the population proportion?
- 9
Interval estimation problem : the population standard deviation is not known, the sample standard deviation is 36, there are 9 observations in the sample. What is the value of the standard error to calculate the confidence interval?
- 10
The standard deviation of the sampling distribution of the sample mean is ___________ than the population standard deviation?
- 11
Which of the following is not necessary when calculation a confidence interval for an unknown population mean?
- 12
Interval estimation : the limits of the confidence interval are (205, 245), the significance level is 0.05. What is the sample arithmetic mean?
- 13
In a population there are 5 observations, how many different samples of size 4 can be created from this population?
- 14
Sample values for a continuous variable are as follows (phone charger output voltage ; as volt) : 4.4, 5.6, 4.5, and 5.5. What is the point estimate of the population arithmetic mean?
- 15
____________________________ is the probability distribution of all possible sample means that can be created from a population with a fixed sample size of n.
- 16
An investigator has created a sample arithmetic mean and used the number found as the population parameter value, What kind of estimation is used in this process?
- 17
Sample values for a continuous variable are as follows (laptop computer's temperature in an hour ; as oC) : 42, 45, 47, 54, and 58. What is the point estimate of the population arithmetic mean?
- 18
In poin estimation, What is sample statistic called for population parameter?
- 19
12, 8, 7, 6 15, 22
What is the standard deviation of the sample given above?
- 20
___________ of the sample mean is the probability distribution of all possible sample means that can be created from a population with a fixed sample size of n?