Using the simple random sample of weights of women from a data‹ set, we obtain these sample‹ statistics: nequals=35 and x overbarxequals=141.54 lb. Research from other sources suggests that the population of weights of women has a standard deviation given by sigmaσequals=31.42 lb.
a. Find the best point estimate of the mean weight of all women.
b. Find a 9090‹% confidence interval estimate of the mean weight of all women.
a. The best point estimate is nothing lb.
‹(Type an integer or a‹ decimal.)
b. The 90‹% confidence interval estimate is nothing lb less than0.10.1
Identify the test statistic for this hypothesis test.
The test statistic for this hypothesis test is nothing.
‹(Round to two decimal places as‹ needed.)
An IQ test is designed so that the mean is 100 and the standard deviation is 20 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 95‹% confidence that the sample mean is within 5 IQ points of the true mean. Assume that sigmaσequals=20 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation.
A‹ golf-course architect has four linden‹ trees, four white birch‹ trees, and two bald cypress trees to plant in a row along a fairway. In how many ways can the landscaper plant the trees in a‹ row, assuming that the trees are evenly‹ spaced?
In a‹ study, researchers wanted to measure the effect of alcohol on the hippocampal‹ region, the portion of the brain responsible for‹ long-term memory‹ storage, in adolescents. The researchers randomly selected 21 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm cubed. An analysis of the sample data revealed that the hippocampal volume is approximately normal with x overbarequals8.15 cm cubed and sequals0.7 cm cubed. Conduct the appropriate test at the alphaequals0.01 level of significance.‹: mu
–¼
nothing
Upper H 1‹: mu
–¼
greater than
equals
not equals
less than
nothing
‹(Type integers or decimals. Do not‹ round.)
Identify the‹ t-statistic.
t= what ‹(Round to two decimal places as‹ needed.)
Identify the‹ P-value.
est the hypothesis using the‹ P-value approach. Be sure to verify the requirements of the test.
Upper H 0‹: pequals0.5 versus Upper H 1‹: pgreater than0.5
nequals250‹; xequals135‹, alphaequals0.05
Is np 0 left parenthesis 1 minus p 0 right parenthesisgreater than or equals‹10?
Yes or noUse technology to find the‹ P-value.
‹P= what
3. Historically, the number of hurricanes hitting Boca Raton each year follows a Poisson distribution with a mean of 1. What is the probability that 4 or more hurricanes hit the town in a year?
George secured an adjustable-rate mortgage (ARM) loan to help finance the purchase of his home 5 years ago. The amount of the loan was $250,000 for a term of 30 years, with interest at the rate of 5%/year compounded monthly. Currently, the interest rate for his ARM is 3.5%/year compounded monthly, and George’s monthly payments are due to be reset. What will be the new monthly payment? (Round your answer to the nearest cent.)
1149.29
The mean salary offered to students who are graduating from Coastal State University this year is
$
24,260, with a standard deviation of
$
3643. A random sample of
80Coastal State students graduating this year has been selected. What is the probability that the mean salary offer for these
80students is
$
24,500or less?
Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
john is 4 yeqrsolder than mark.Mark is 6 years older thanwinston. total of age is 130how old afe each. how to wriye algebra ptpble john is 4 years older than Mark Mark is 6 years older than wesrine total age for all total =130. write a algebra problem. John is 4 years older than mark mark andmark is 6 years than westine what are rhe ages that add to 130
……
Let Westine’s age be x
Then Mark’s age is (x+6)
And John’s age is (x+6) + 4
haphazardly mixed multiple techniques.were generally ineffective treatments.had no real influence on its development.often employed unethical procedures.
Son of cousin shoots his arrow straight up into the air at 77 m/s from the top of a 22 m tall cliff. What is the velocity of the arrow the instant it hits the ground? how long does it take for the arrow to land?
For velocity while hitting the ground,
In a simple linear regression analysis, the correlation coefficient (a) and the slope (b) ___________ have the same sign.
if there are 100,994,367 balls and 5% of them are black with the other 95% being white, how many would you need to pick up at one time to make it so you have a greater than 50% of getting at least one black ball?
how many balls would some need to pick from the collection at the same time to make it so that there is a greater than 50% chance of picking at least one black ball?