Question
In: Statistics and Probability
In a study of children with a particular disorder, parents were asked to rate their child...
In a study of children with a particular disorder, parents were asked to rate their child on a variety of items related to how well their child performs different tasks. One item was "Has difficulty organizing work," rated on a five-point scale of 0 to 4 with 0 corresponding to "not at all" and 4 corresponding to "very much." The mean rating for 287 boys with the disorder was reported as 2.27 with a standard deviation of 1.11. (Round your answers to four decimal places.) Compute the 90% confidence interval. , Compute the 95% confidence interval. , Compute the 99% confidence interval. , Explain the effect of the confidence level on the width of the interval. We see that the width of the interval increases with confidence level. We see that the width of the interval does not change with confidence level. We see that the width of the interval decreases with confidence level.
Solutions
orchestra answered 2 years agoRelated Solutions
In a study of children with a particular disorder, parents were asked to rate their child...
In a study of children with a particular disorder, parents were
asked to rate their child on a variety of items related to how well
their child performs different tasks. One item was "Has difficulty
organizing work," rated on a five-point scale of 0 to 4 with 0
corresponding to "not at all" and 4 corresponding to "very much."
The mean rating for 285 boys with the disorder was reported as 2.39
with a standard deviation of 1.17. (Round your...
1. In a study of children with a particular disorder, parents were asked to rate their...
1. In a study of children with a particular disorder, parents
were asked to rate their child on a variety of items related to how
well their child performs different tasks. One item was "Has
difficulty organizing work," rated on a five-point scale of 0 to 4
with 0 corresponding to "not at all" and 4 corresponding to "very
much." The mean rating for 274 boys with the disorder was reported
as 2.34 with a standard deviation of 1.07. (Round...
A recent study reported that 59% of the children in a particular community were overweight or...
A recent study reported that
59%
of the children in a particular community were overweight or
obese. Suppose a random sample of
300
public school children is taken from this community. Assume the
sample was taken in such a way that the conditions for using the
Central Limit Theorem are met. We are interested in finding the
probability that the proportion of overweight/obese children in
the sample will be greater than
0.55
Complete parts (a) and (b) below.
a. Before...
A recent study reported that 51% of the children in a particular community were overweight or...
A recent study reported that 51% of the children in a
particular community were overweight or obese. Suppose a random
sample of 500 public school children is taken from this community.
Assume the sample was taken in such a way that the conditions for
using the Central Limit Theorem are met. We are interested in
finding the probability that the proportion of overweight/obese
children in the sample will be greater than 0.47. Complete parts
(a) and (b) below. . Calculate...
Attention deficit hyperactivity disorder (ADHD) in young children presents significant challenges to the children, their parents,...
Attention deficit hyperactivity disorder (ADHD) in young
children presents significant challenges to the children, their
parents, and their classroom teachers. Stimulant medication can
effectively treat 60% to 70% of youth with ADHD. Yet many parents
seek alternative therapies, and Hypericum perforatum (St John's
wort) is 1 of the top 3 alternative therapies used.
In a recent study in the Journal of the American Medical
Association, Hypericum perforatum (St John's Wort) for
Attention-Deficit/Hyperactivity Disorder in Children and
Adolescents, 2008;299(22):2633-2641, the authors...
A particular paper described a study of children who were underweight or normal weight at age...
A particular paper described a study of children who were
underweight or normal weight at age 2. Children in the sample were
classified according to the number of sweet drinks consumed per day
and whether or not the child was overweight one year after the
study began. Is there evidence of an association between whether or
not children are overweight after one year and the number of sweet
drinks consumed? Assume that it is reasonable to regard the sample
of...
In a study of parents who have children with ADHD, a simple random sample of parents...
In a study of parents who have children with ADHD, a simple
random sample of parents were asked to rate their overall stress
level. A higher score indicates greater stress. The mean rating for
the 50 parents in the study was reported to be 46.8 with a standard
deviation of 10.34. The researchers considered a score greater than
45 to represent extreme stress. Is there evidence that the mean
stress level for the parents in this study is above this...
A child having two heterozygous parents with a dominant genetic disorder has with chance of inheriting...
A
child having two heterozygous parents with a dominant genetic
disorder has with chance of inheriting that disorder? Explain your
answer.
Response should be minimum 300 words
Cystic fibrosis is a recessive disorder. If a child comes from two heterozygous parents, what is...
Cystic fibrosis is a recessive disorder. If a child comes from
two heterozygous parents, what is the chance that the child will
have it too?
25%
75%
50%
100%
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below (1equalsnot attractive; 10equalsextremely
attractive). Construct a confidence interval using a 90%
confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult females? 5,
9, 3, 8, 5, 4, 7, 7, 9, 10, 6, 9 What is the confidence
interval for the population mean mu? less...
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