Practice Math Statistics Problems and Master the Concepts

in a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. how many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? assume that we want 96% confidence that the error is no more than 4 percentage points

Ariana Montgomery2022-07-19

find the point estimate of the proportion of people who wear hearing aids if in a random sample of 898 people, 46 people had hearing aids

Emmanuel Pace 2022-07-19

In the Florida lottery game, you select six numbers from a pool of numbers from 1 to 53 (see flalottery.com). Each wager costs $1. You win the jackpot if you match all six numbers that you have selected (Questions f to i are optional. Questions f to i will not be graded). Find the probability of a) Wining the jackpot. b) Matching five numbers. c) Matching four numbers. d) Matching three numbers. e) Matching two numbers.

Elianna Lawrence 2022-07-19

Assume I have an independent $X_{1}, X_{2}, \dots, X_{n}$ with $X_{i} \sim N (i, i^{2})$ and I want to find a statistic that has a t distribution with $2$ degrees of freedom.
How can we show this?

iarc6io 2022-07-19

How do you find the exact value of $\arccos (\sin (\frac{π}{3}))$ ?

jayeshmahadik6879 2022-07-19

when normal distribution curve is more flatter in the case on

Emmanuel Pace 2022-07-18

How do you find the exact value of $\cos$ 180 degrees - $\sin$ 180 degrees?

Talon Mcbride 2022-07-18

The concentration of alcohl in a person's bloodstream is measurable. Suppose that the relative risk R of having an accident while driving a car can be modeled by an equation of the form $R = e^{k x}$ where x is the percent of concentration of alcohol in the bloodstream and k is a constant. If the law asserts that anyone with a relative risk of having an accident of 5 or more should not have driving privileges, at what concentration of alcohol in the bloodstream shoulda driver be arrested and charged with a DUI?

Raynor2i 2022-07-18

True and False?
There is no one-to-one correspondence between the set of all positive integers and the set of all odd positive integers because the second set is a proper subset of the first.

Ciara Rose 2022-07-17

True and False?
If $(A \cup B \subset A \cup C)$ then $B \subset C$

Lillie Pittman 2022-07-17

How do you find the exact value of $\tan (\sin^{- 1} (0.1))$ ?

kislotd 2022-07-17

A statistics professor wants to know how her students feel about an introductory statistics course and decides to administer a survey to a random sample of students taking the course. If she randomly selects a class rank (freshmen, sophomores, juniors and seniors) and survey every student in that class rank, what sampling method does she use?

Darian Hubbard 2022-07-16

Define and explain the ecological levels of analysis in community psychology

Cristofer Graves 2022-07-16

How can separate samples of optical isomers be distinguished?

Talon Mcbride 2022-07-16

determine what type of sampling technique is used (Simple Random Sampling, Stratified Random Sampling, Systematic Sampling, Cluster Sampling, or Convenience Sampling).
A company is taking a survey of its employees and separates them into the following groups: Male/Part-Time, Male/Full-Time, Female/Part-Time, Female/Full- Time.

Francisco Proctor 2022-07-16

How do you find the exact value of $\ln (\frac{1}{\sqrt{e}})$ ?

termegolz6 2022-07-16

Show that if a function of a sufficient statistic is ancillary, then the sufficient statistic is not complete.

kislotd 2022-07-16

Explain in your own words what pooled variance is. If you have two different samples of different sizes (the n for each group is different_, explain wether the value of the pooled variance will be closer to the larger sample or smaller sample.

Lexi Mcneil 2022-07-16

The intelligence quotients (IQs) of 16 students from one area of a city showed a mean of 107 and a standard deviation of 10, while the IQs of 14 students from another area of the city showed a mean of 112 and a standard deviation of 8. Use alpha = 0.01. What is the pooled standard deviation?

beatricalwu 2022-07-15

Site the implications of Bronfenbrenner's theory to the child's development. Give examples in each ecological system.

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