'point) A firm wants to test ifthe drying time of two types of paints are significantly different Each paint to 13 different items: The average drying time and the standard deviation of paint is 24 minutes applied L and minutes respectively. For paint 2, the values are 29 minutes and 5 minutes respectively. Are the drying times significantly different at a-0.05?'
Added by Enrique S.
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State the null and alternative hypotheses: Null hypothesis: The drying times of the two types of paints are not significantly different. Alternative hypothesis: The drying times of the two types of paints are significantly different. Show more…
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2. Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints. The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained. Paint 1 | Paint 2 | Paint 3 | Paint 4 128 | 144 | 133 | 150 137 | 133 | 143 | 142 135 | 142 | 137 | 135 124 | 146 | 136 | 140 141 | 130 | 131 | 153 At the ̑ = 0.05 level of significance, test to see whether the mean drying time is the same for each type of paint.
Sheryl E.
A paint manufacturing company claims that the mean drying time for its paint is greater than 45 minutes. A random sample of 35 paints was tested and the result obtained as followed: N: 35, Mean: 49.814, Std. Deviation: 2.3462, Std. Error Mean: .3966 Test Value = 45 t: 12.139, df: 34, Sig. (2-tailed): .000, Mean Difference: 4.8143 99% Confidence Interval of the Difference: Lower 3.732, Upper 5.896 At 1% significant level, is there any sufficient evidence to support the company claim? Assume that the drying time is normally distributed.
Robin C.
Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints. The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained. At the $\alpha=.05$ level of significance, test to see whether the mean drying time is the same for each type of paint.
Umar Sohail Q.
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