294 results in Content created by Newcastle University - search across all projects.
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Question
Given a random variable X normally distributed as N(m,σ2) find probabilities P(X>a),a>m;P(X<b),b<m.
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Number Theory.
Given n∈N find μ(n),τ(n),σ(n),ϕ(n).
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Solving three simultaneous congruences using the Chinese Remainder Theorem:
\begin{eqnarray*} x\;&\equiv&\;b_1\;&\mod&\;n_1\\ x\;&\equiv&\;b_2\;&\mod&\;n_2\\x\;&\equiv&\;b_3\;&\mod&\;n_3 \end{eqnarray*} where \operatorname{gcd}(n_1,n_2,n_3)=1
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Solving two simultaneous congruences:
\begin{eqnarray*} c_1x\;&\equiv&\;b_1\;&\mod&\;n_1\\ c_2x\;&\equiv&\;b_2\;&\mod&\;n_2\\ \end{eqnarray*} where \operatorname{gcd}(c_1,n_1)=1,\;\operatorname{gcd}(c_2,n_2)=1,\;\operatorname{gcd}(n_1,n_2)=1
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Exam (1 question)
Statistics and probability. Practice exam, one-way Anova for PSY2010.
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Question
Given two propositions in mathematics using quantifiers, choose the corresponding negation of the proposition. For example, the negation of: \displaystyle \exists a \in \mathbb{R^+},\;\exists b \in \mathbb{N},\;\exists c \in \mathbb{N}\;\left[(c \lt b+1) \land \left(\frac{1}{2^n} \geq 3a\right)\right]
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Exam (6 questions)
Practice questions on these topics.
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Find gcd g of two positive integers x, y and also find integers a, b such that ax+by=g with prescribed intervals for a and b.
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One-way ANOVA example
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Given m \in \mathbb{N}, find all n \in \mathbb{N} such that \phi(n)=m and enter the largest and second largest if they exist.
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No description given
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Given one solution of the quadratic equation in \mathbb{Z}_n where n=pq is a product of two primes find the other 3 solutions.
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Calculations in \mathbb{Z_n} for three values of n.
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Exam (5 questions)
Questions about logical predicates, and basic set theory concepts.
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Solving a pair of congruences of the form \begin{align}x &\equiv b_1\;\textrm{mod} \;n_1\\x &\equiv b_2\;\textrm{mod}\;n_2 \end{align} where n_1,\;n_2 are coprime.
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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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No description given
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Given m \in \mathbb{N}, find the smallest natural number n \in \mathbb{N} with \tau(n)=m divisors.
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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.
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Multiplication of 2 \times 2 matrices.
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Two ordered data sets, each with 10 numbers. Find the sample standard deviation for each and for their sum.
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Exam (13 questions)
Questions on matrix arithmetic.
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Very elementary matrix multiplication.
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Two ordered data sets, each with 10 numbers. Find the sample standard deviation for each and for their sum.
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Sample of size 24 is given in a table. Find sample mean, sample standard deviation, sample median and the interquartile range.
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Given a 3x3 matrix with very big elements, perform row operations to find a matrix with single-digit elements. Then reduce that to an upper triangular matrix, and hence find the determinant.
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Given 32 datapoints in a table find their minimum, lower quartile, median, upper quartile, and maximum.
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Exam (9 questions)Questions used in a university course titled "Methods for solving differential equations"
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Exercise using a given uniform distribution Y, calculating the expectation and variance as well as asking for the CDF. Also finding P( b \lt Y \lt c) for given values of b,\;c.
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Exam (1 question)
Statistics and probability. One question on multiple and partial correlation.