453 results.
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Question in Content created by Newcastle University
Given a discrete random variable $X$ find the expectation of $1/X$ and $e^X$.
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Question in Content created by Newcastle University
Arrivals given by exponential distribution, parameter $\theta$ and $Y$, sample mean on inter-arrival times. Find and calculate unbiased estimator for $\theta$.
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Question in Content created by Newcastle University
Given 3 observations from a $\operatorname{Poisson}(\mu)$ distribution find the likelihood, the log likelihood and the MLE for $\mu$.
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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.
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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 $\lambda$.
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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 $\lambda$.
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Question in Content created by Newcastle University
Looking up t-tables.
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Question in Content created by Newcastle University
Approximating integral of a linear function by Riemann sums . Includes an interactive graph in Advice showing the approximations given by the upper and lower sums and how they vary as we increase the number of intervals.
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Question in Content created by Newcastle University
Multiple response question (2 correct out of 4) covering properties of Riemann integration. Selection of questions from a pool.
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Question in Content created by Newcastle University
Approximating integral of a linear function by Riemann sums . Includes an interactive graph in Advice showing the approximations given by the upper and lower sums and how they vary as we increase the number of intervals.
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Question in Content created by Newcastle University
Approximating integral of a quadratic by Riemann sums . Includes an interactive graph in Advice showing the approximations given by the upper and lower sums and how they vary as we increase the number of intervals.
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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 chi-squared statistic to test the null hypothesis that there is no association.
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Question in Content created by Newcastle University
Find out whether the data presented in this question follows a Poisson distribution. Uses the $\chi^2$ test.
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Question in Content created by Newcastle University
Uses the $\chi^2$ test to see if there is any significant difference in preferences.
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Question in Content created by Newcastle University
Eight questions on finding least upper bounds and greatest lower bounds of various sets.
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Question in Content created by Newcastle University
Given a random variable $X$ normally distributed as $\operatorname{N}(m,\sigma^2)$ find probabilities $P(X \gt a),\; a \gt m;\;\;P(X \lt b),\;b \lt m$.
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Question in Content created by Newcastle University
Choosing whether given random variables are qualitative or quantitative.
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Question in Content created by Newcastle University
Deciding whether or not three sampling methods are simple random sampling, stratified sampling, systematic or judgemental sampling. Also whether or not the method of selection is random, quasi-random or non-random.
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Question in Content created by Newcastle University
Given a table of the number of days in which sales were between £x1000 and £(x+1)1000 find the relative percentage frequencies of these volume of sales.
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Question in Content created by Newcastle University
Find a regression equation.
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Question in Content created by Newcastle University
Given sample data find mean, standard deviation, median, interquartile range,
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Question in Content created by Newcastle University
Find a regression equation.
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Question in Content created by Newcastle University
Given random set of data (between 13 and 23 numbers all less than 100), find their stem-and-leaf plot.
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Question in Content created by Newcastle University
Finding probabilities from a survey giving a table of data on the alcohol consumption of males. This can be easily adapted to data from other types of surveys.
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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.
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Question in Content created by Newcastle University
Given descriptions of 3 random variables, decide whether or not each is from a Poisson or Binomial distribution.
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Question in Content created by Newcastle University
Given data on probabilities of three levels of success of three options and projections of the profits that the options will accrue depending on the level of success, find the expected monetary value (EMV) for each option and choose the one with the greatest EMV.
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Question in Content created by Newcastle University
Independent events in probability. Choose whether given three given pairs of events are independent or not.
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Question in Content created by Newcastle University
Given $\frac{a}{b} \in \mathbb{Q}$ for suitable choices of $a$ and $b$, find all $n \in \mathbb{N}$ such that $\phi(n)=\frac{a}{b}n$.
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Question in Content created by Newcastle University
Given $m \in \mathbb{N}$, find the smallest natural number $n \in \mathbb{N}$ with $\tau(n)=m$ divisors.