Question

Herd immunity is only considered effective when it occurs in ______% of population.

50%

80%

95%

100%

Answer #1

Herd immunity, also called as population immunity or community immunity is a type of immunity which is achieved when a high percentage or group of people are immune to a certain condition or infection. The immunity can be achieved either through vaccination or due to previously being susceptible to that infection or with that disease. Thereby, gaining future protection against that particular organism or ailment in a group or community of people is called herd immunity. Developing herd immunity depends on the rate of spread of the disease, if fast spreading- needs more time to achieve immunity. According to WHO, for a population to be immune, 70-90% of them should be immune to that particular disease/condition.

Based on the options provided, 80% is the correct one.

For herd immunity to have optimal and maximum effect, a
significant percentage of the population should be vaccinated to
ensure that the probability of people with the condition or
infection interacting with susceptible non-vaccinated people is
low. True or False??

A phenotypic trait is considered sex-linked when
a trait occurs only in males
the genes for the phenotype occur on X or Y chromosomes
the phenotype is expressed only after sexual intercourse
the phenotype occurs only in females
the phenotype is polygenic for both sexes
An individual that has two different alleles for the same trait
is said to be
polygenic.
recessive.
homozygotic.
heterozygotic.
pleiotropic.

If n = 100 and X = 80, construct a 95% confidence interval for
the population proportion, p. Give your answers to three decimals
< p

Exercise 1. Based on the following information:
Population 1
Population 2
n1 = 50
n2= 80
x1 = 355
x2 = 320
population standard deviation 1= 34
population standard deviation 2= 40
What is the best point estimate for the difference between two
population means (mean 1− mean 2)?
Construct a 95% confidence interval estimate for the difference
between two population means.

Natural selection occurs when
A) a new genetic variation occurs that allows individuals to
have a reproductive and survival advantage.
B) a factor in the environment alters the genetic information in
DNA of all members of a species.
C) only when nonrandom mating occurs.
D) when a small number of individuals of a population break away
and form a new population.

Construct a 95% confidence interval to estimate the population
proportion using the data below. x=23 n=80 N=500 The 95%
confidence interval for the population proportion is
The 95% confidence interval for the population proportion is
:

Construct a 95% confidence interval to estimate the population
mean using the data below.
With 95 % confidence, when nequals= 50 the population mean is
between a lower limit of _____ and an upper limit of ______

If you want to be 95% confident when estimating the population
mean to within a sampling error of ± 20 and the standard deviation
is assumed to be 100, what sample size is required?

Construct an 80% confidence interval to estimate the population
mean when x overbarequals139 and s = 29 for the sample sizes
below.
a) n=30 b) n=60 c) n=100
a) The 80% confidence interval for the population mean when
n=30 is from a lower limit --- of nothing to an upper limit of----
nothing. (Round to two decimal places as needed.)
b) The 80% confidence interval for the population mean when
n=60 is from a lower limit--- of nothing to an...

Let X represent the number that occurs when a 50-sided red die
is tossed and Y the number that occurs when a 50-sided green die is
tossed a) find E(X+Y)

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