Question

A matching layer is placed in front of an ultrasound sound transducer to decrease the difference in impedances.

This (increases/decreases) the T coefficient.

Answer #1

Question 14
One reflector is 5 times deeper than another. The time of
flight of sound to the deeper structure is the time of flight of
the shallower reflector.
less than
five times more than
equal to
one fifth as much as
Question 15
2 Points
The redirection of a portion of the sound beam back to the
transducer is known as:
reflection
refraction
Snell's Law
interface
Question 16
2 Points
Attenuation decreases with increasing ________.
intensity
wavelength
frequency
path...

1. In one-sample t test, the difference between the mean
of your sample and μ increases. Will t-value and P-value will
increase, decrease, get closer to zero, or farther from
zero?
2. In a one sample t test, the variance of your sample
increases. Will t-value and P-value will increase, decrease, get
closer to zero, or farther from zero?
3. In a two sample t test, the difference between the
means of your samples decreases. Will t-value and P-value will...

Q3) In a difference of proportion test with alpha= .01, the
critical value for a one tailed lower test is/are:
A) -1.96 B) -1.645 and 1.645
C) -2.33 D) -1.28
Q4) If the test statistic for a small sample difference of means
test is t*=-2.15, we could reject the Null Hypothesis at alpha =.01
for a two tailed test with degrees of freedom equal to 20:
true or false
Q9) In a difference of MEans test there are two sources...

1.The sample mean is an unbiased estimator for
the population mean. This means:
The sample mean always equals the population mean.
The average sample mean, over all possible samples, equals the
population mean.
The sample mean will only vary a little from the population
mean.
The sample mean has a normal distribution.
2.Which of the following statements is
CORRECTabout the sampling distribution of the
sample mean:
The standard error of the sample mean will decrease as the
sample size increases....

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