204 results for "sample".

Find a confidence interval given the mean of a sample, population variance known adaptive marking DraftQuestion in MATH6059
Finding the confidence interval at either 90%, 95% or 99% for the mean given the mean of a sample. The population variance is given and so the z values are used. Various scenarios are included.

Question in Adelle's workspace
This question provides a list of data to the student. They are asked to find the mean, median, mode and range.

Question in Demos
Two sample ttest to see if there is a difference between scores on questions between two groups when the questions are asked in a different order.

Question in Newcastle University Sports Science
Sample of size $24$ is given in a table. Find sample mean, sample standard deviation, sample median and the interquartile range.

Question in Content created by Newcastle University
Cartesian form of the parametric representation of a surface, normal vector, and magnitude.
Accuracy for part c) should be made more stringent as can be marked correct for an incorrect answer. Use a different sample range rather than 0 to 1 would help as would setting accuracy to something less than 0.001.

Exam (2 questions) in Content created by Newcastle University
Statistics and probability. 2 questions, 1 on two sample ttest and 1 on paired ttest.

Question in Content created by Newcastle University
Given mean and sd of 1000 sample returns on a scale of 1 to 7 together with a given score, find the zscore.
Also find the 95% confidence interval for the population mean.

Question in Content created by Newcastle University
Given data on population mean and population standard deviation and three sampling sizes, calculate the probabilities that the sample means are within a specified distance from the population mean.

Question in Content created by Newcastle University
Two sample ttest to see if there is a difference between scores on questions between two groups when the questions are asked in a different order.

Question in Content created by Newcastle University
Given sum of sample from a Normal distribution with unknown mean $\mu$ and known variance $\sigma^2$. Find MLE of $\mu$ and one of four functions of $\mu$.

Question in Content created by Newcastle University
Using a random sample from a population with given mean and variance, find the expectation and variance of three estimators of $\mu$. Unbiased, efficient?

Question in Content created by Newcastle University
Arrivals given by exponential distribution, parameter $\theta$ and $Y$, sample mean on interarrival times. Find and calculate unbiased estimator for $\theta$.

Question in Content created by Newcastle University
Paired ttest to see if there is a difference between times take in a task.

Question in Content created by Newcastle University
For a sample of size n from a normal distribution and given the mean of the sample and the standard deviation of the distribution, find the MLE for the mean. Also the expected information and a confidence interval for the mean.

Question in Content created by Newcastle University
For a sample of size n from a Poisson distribution $\operatorname{Poisson}(\lambda)$ and given the mean of the sample, find the MLE for $\lambda$. Also find the expected information and a confidence interval for $\lambda$.

Question in Content created by Newcastle University
For a sample of size n from an Exponential distribution $\operatorname{Exponential}(\lambda)$ and given the mean of the sample, find the MLE for $\lambda$. Also find the expected information and a confidence interval for $\lambda$.

Question in Content created by Newcastle University
For a sample of size n from a normal distribution, given mean of the sample mean and the standard deviation , find the tstatistic corresponding to a null hypothesis $\mu=m$ and a given confidence level. Check if the result is significant at this level.

Question in Content created by Newcastle University
Find a regression equation.

Question in Content created by Newcastle University
Given sample data find mean, standard deviation, median, interquartile range,

Question in Content created by Newcastle University
The human resources department of a large finance company is attempting to determine if an employee’s performance is influenced by their undergraduate degree subject. Personnel ratings are used to judge performance and the task is to use expected frequencies and the chisquared statistic to test the null hypothesis that there is no association.

Question in Content created by Newcastle University
Simple probability question. Counting number of occurences of an event in a sample space with given size and finding the probability of the event.

Question in Content created by Newcastle University
Finding the confidence interval at either 90%, 95% or 99% for the mean given the mean of a sample. The population variance is given and so the z values are used. Various scenarios are included.

Question in Content created by Newcastle University
Multiple correlation question. Given the correlation coefficent of $Y$ with $X_1$ is $r_{01}$, the correlation coefficent of $Y$ with $X_2$ is $r_{02}$ and the correlation coefficent of $X_1$ with $X_2$ is $r_{12}$ then explain the proportion of variablity of $Y$. Also find the partial corr coeff between $Y$ and $X_2$ after fitting $X_1$ and find how much of the remaining variability in $Y$ is explained by $X_2$ after fitting $X_1$.

Question in Content created by Newcastle University
Given 32 datapoints in a table find their minimum, lower quartile, median, upper quartile, and maximum.

Question in Content created by Newcastle University
Sample of size $24$ is given in a table. Find sample mean, sample standard deviation, sample median and the interquartile range.

Question in Content created by Newcastle University
Two ordered data sets, each with 10 numbers. Find the sample standard deviation for each and for their sum.

Question in Content created by Newcastle University
Two ordered data sets, each with 10 numbers. Find the sample standard deviation for each and for their sum.

Question in Content created by Newcastle University
Provided with information on a sample with sample mean and standard deviation, but no information on the population variance, use the t test to either accept or reject a given null hypothesis.

Question in Content created by Newcastle University
Normal distribution $X \sim N(\mu,\sigma^2)$ given. Find $P(a \lt X \lt b)$. Find expectation, variance, $P(c \lt \overline{X} \lt d)$ for sample mean $\overline{X}$.

Question in Content created by Newcastle University
Given 32 datapoints in a table find their minimum, lower quartile, median, upper quartile, and maximum.