Answer:
a: 28 < µ < 34
Step-by-step explanation:
We need the mean, var, and standard deviation for the data set. See first attached photo for calculations for these...
We get a mean of 222/7 = 31.7143
and a sample standard deviation of: 4.3079
We can now construct our confidence interval. See the second attached photo for the construction steps.
They want a 90% confidence interval. Our sample size is 7, so since n < 30, we will use a t-score. Look up the value under the 10% area in 2 tails column, and degree of freedom is 6 (degree of freedom is always 1 less than sample size for confidence intervals when n < 30)
The t-value is: 1.943
We rounded down to the nearest person in the interval because we don't want to over estimate. It said 28.55, so more than 28 but not quite 29, so if we use 29 as the lower limit, we could over estimate. It's better to use 28 and underestimate a little when considering customer flow.
Answer:
grumpy is 20 happy is 80
Step-by-step explanation:
Answer:
The y intercept is -1
Step-by-step explanation:
y-14=6(x-2.5)
We need to get the equation in the form y = mx+b where b is the y intercept
Distribut the 6
y-14 = 6x -15
Add 14 to each side
y-14+14 = 6x-15+14
y = 6x-1
The y - intercept is -1
Answer:
Step-by-step explanation:
The general vertex form of parabola is,
where,
(h, k) is the vertex of the parabola.
The given function is,
This is vertex form the given function.
Answer:
The rate of this account corresponds to a increse of 25%.(Option 4)
Step-by-step explanation:
To find out the increase/decrease rate, first we need to re express the exponential term:
V=750*(0.80)^-x
By applying the respectives properties we can express the exponent of the equation as follows:
(0.80)^-x = 1/(0.8^x) = (1^x)/(0.8^x) = (1/0.8)^x = 1.25^x
Then the Kalani's stock investments can be written as:
V=750*1.25^x
Then the above equation can be expressed as:
V=750*(1+0.25)^x
Where 0.25 represents a increment rate of 25%
